diff --git a/Makefile b/Makefile
index 0fa916dc..88e673bf 100644
--- a/Makefile
+++ b/Makefile
@@ -5,15 +5,16 @@ JOBS               := 1
 TARGET             := i386-mingw32msvc
 SOURCEFORGE_MIRROR := kent.dl.sourceforge.net
 
-VERSION := 2.5
-PREFIX  := $(PWD)/usr
-PKG_DIR := $(PWD)/pkg
-TMP_DIR  = $(PWD)/tmp-$(1)
-TOP_DIR := $(patsubst %/,%,$(dir $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))))
-PATH    := $(PREFIX)/bin:$(PATH)
-SHELL   := bash
-SED     := $(shell gsed --help >/dev/null 2>&1 && echo g)sed
-INSTALL := $(shell ginstall --help >/dev/null 2>&1 && echo g)install
+VERSION  := 2.5
+PREFIX   := $(PWD)/usr
+PKG_DIR  := $(PWD)/pkg
+TMP_DIR   = $(PWD)/tmp-$(1)
+MAKEFILE := $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))
+TOP_DIR  := $(patsubst %/,%,$(dir $(MAKEFILE)))
+PATH     := $(PREFIX)/bin:$(PATH)
+SHELL    := bash
+SED      := $(shell gsed --help >/dev/null 2>&1 && echo g)sed
+INSTALL  := $(shell ginstall --help >/dev/null 2>&1 && echo g)install
 
 # unset any environment variables which might cause trouble
 AR =
@@ -40,13 +41,6 @@ SHORT_PKG_VERSION = \
 PKG_RULES := $(patsubst $(TOP_DIR)/src/%.mk,%,$(wildcard $(TOP_DIR)/src/*.mk))
 include $(TOP_DIR)/src/*.mk
 
-CHECK_ARCHIVE = \
-    $(if $(filter %.tgz,    $(1)),tar tfz '$(1)' >/dev/null 2>&1, \
-    $(if $(filter %.tar.gz, $(1)),tar tfz '$(1)' >/dev/null 2>&1, \
-    $(if $(filter %.tar.bz2,$(1)),tar tfj '$(1)' >/dev/null 2>&1, \
-    $(if $(filter %.zip,    $(1)),unzip -t '$(1)' >/dev/null 2>&1, \
-    $(error Unknown archive format: $(1))))))
-
 UNPACK_ARCHIVE = \
     $(if $(filter %.tgz,    $(1)),tar xvzf '$(1)', \
     $(if $(filter %.tar.gz, $(1)),tar xvzf '$(1)', \
@@ -57,6 +51,18 @@ UNPACK_ARCHIVE = \
 UNPACK_PKG_ARCHIVE = \
     $(call UNPACK_ARCHIVE,$(PKG_DIR)/$($(1)_FILE))
 
+PKG_CHECKSUM = \
+    sha1sum -b '$(PKG_DIR)/$($(1)_FILE)' | $(SED) -n 's,^\([0-9a-f]\{40\}\).*,\1,p'
+
+CHECK_PKG_ARCHIVE = \
+    [ '$($(1)_CHECKSUM)' == "`$(call PKG_CHECKSUM,$(1))`" ]
+
+DOWNLOAD_PKG_ARCHIVE = \
+    $(if $($(1)_URL_2), \
+        wget -T 30 -t 3 -c -O '$(PKG_DIR)/$($(1)_FILE)' '$($(1)_URL)' \
+        || wget -c -O '$(PKG_DIR)/$($(1)_FILE)' '$($(1)_URL_2)', \
+        wget -c -O '$(PKG_DIR)/$($(1)_FILE)' '$($(1)_URL)')
+
 .PHONY: all
 all: $(PKG_RULES)
 
@@ -66,12 +72,10 @@ $(1): $(PREFIX)/installed-$(1)
 $(PREFIX)/installed-$(1): $(TOP_DIR)/src/$(1).mk $(addprefix $(PREFIX)/installed-,$($(1)_DEPS))
 	[ -d '$(PREFIX)' ] || mkdir -p '$(PREFIX)'
 	[ -d '$(PKG_DIR)' ] || mkdir -p '$(PKG_DIR)'
-	cd '$(PKG_DIR)' && ( \
-	    $(call CHECK_ARCHIVE,$($(1)_FILE)) || \
-	    $(if $($(1)_URL_2), \
-	        wget -T 30 -t 3 -c -O '$($(1)_FILE)' '$($(1)_URL)' || \
-	            wget -c -O '$($(1)_FILE)' '$($(1)_URL_2)', \
-	        wget -c -O '$($(1)_FILE)' '$($(1)_URL)'))
+	$(if $$(shell $(call CHECK_PKG_ARCHIVE,$(1)) || echo 'error'),
+	    $(call DOWNLOAD_PKG_ARCHIVE,$(1))
+	    $(call CHECK_PKG_ARCHIVE,$(1))
+	    ,)
 	$(if $(value $(1)_BUILD),
 	    rm -rf   '$(2)'
 	    mkdir -p '$(2)'
@@ -122,17 +126,22 @@ clean-pkg:
 
 .PHONY: update
 define UPDATE
-    $(if $(2), \
-        $(info $(1): $(2)) \
-        $(if $(filter $(2),$($(1)_VERSION)), \
-            , \
-            $(SED) 's/^\([^ ]*_VERSION *:=\).*/\1 $(2)/' -i '$(TOP_DIR)/src/$(1).mk'), \
+    $(if $(2),
+        $(info $(1): $(2))
+        $(if $(filter $(2),$($(1)_VERSION)),
+            ,
+            $(SED) 's/^\([^ ]*_VERSION *:=\).*/\1 $(2)/' -i '$(TOP_DIR)/src/$(1).mk'
+            $(MAKE) -f '$(MAKEFILE)' 'update-checksum-$(1)'),
         $(error Unable to update version number: $(1)))
 
 endef
 update:
 	$(foreach PKG,$(PKG_RULES),$(call UPDATE,$(PKG),$(shell $($(PKG)_UPDATE))))
 
+update-checksum-%:
+	$(call DOWNLOAD_PKG_ARCHIVE,$*)
+	$(SED) 's/^\([^ ]*_CHECKSUM *:=\).*/\1 $(shell $(call PKG_CHECKSUM,$*))/' -i '$(TOP_DIR)/src/$*.mk'
+
 .PHONY: dist
 dist:
 	rm -rf 'mingw_cross_env-$(VERSION)'
diff --git a/src/atk.mk b/src/atk.mk
index fe3dbecf..6b4a61ff 100644
--- a/src/atk.mk
+++ b/src/atk.mk
@@ -1,12 +1,13 @@
 # ATK
 
-PKG            := atk
-$(PKG)_VERSION := 1.24.0
-$(PKG)_SUBDIR  := atk-$($(PKG)_VERSION)
-$(PKG)_FILE    := atk-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.gtk.org/
-$(PKG)_URL     := http://ftp.gnome.org/pub/gnome/sources/atk/$(call SHORT_PKG_VERSION,$(PKG))/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc glib gettext
+PKG             := atk
+$(PKG)_VERSION  := 1.24.0
+$(PKG)_CHECKSUM := 85ff5bd8f1879d2a43dfcf4842fc5ea9125dec11
+$(PKG)_SUBDIR   := atk-$($(PKG)_VERSION)
+$(PKG)_FILE     := atk-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.gtk.org/
+$(PKG)_URL      := http://ftp.gnome.org/pub/gnome/sources/atk/$(call SHORT_PKG_VERSION,$(PKG))/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc glib gettext
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.gtk.org/download-windows.html' | \
diff --git a/src/binutils.mk b/src/binutils.mk
index 56d5903c..c28f5a91 100644
--- a/src/binutils.mk
+++ b/src/binutils.mk
@@ -1,12 +1,13 @@
 # MinGW binutils
 
-PKG            := binutils
-$(PKG)_VERSION := 2.19.1
-$(PKG)_SUBDIR  := binutils-$(firstword $(subst -, ,$($(PKG)_VERSION)))
-$(PKG)_FILE    := binutils-$($(PKG)_VERSION)-src.tar.gz
-$(PKG)_WEBSITE := http://mingw.sourceforge.net/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/mingw/$($(PKG)_FILE)
-$(PKG)_DEPS    := mingwrt w32api
+PKG             := binutils
+$(PKG)_VERSION  := 2.19.1
+$(PKG)_CHECKSUM := 7e930435c47991c4070b1c74b010350e4669011f
+$(PKG)_SUBDIR   := binutils-$(firstword $(subst -, ,$($(PKG)_VERSION)))
+$(PKG)_FILE     := binutils-$($(PKG)_VERSION)-src.tar.gz
+$(PKG)_WEBSITE  := http://mingw.sourceforge.net/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/mingw/$($(PKG)_FILE)
+$(PKG)_DEPS     := mingwrt w32api
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=2435&package_id=11290' | \
diff --git a/src/boost.mk b/src/boost.mk
index 0ab88830..2d08a5d6 100644
--- a/src/boost.mk
+++ b/src/boost.mk
@@ -1,12 +1,13 @@
 # Boost C++ Library
 
-PKG            := boost
-$(PKG)_VERSION := 1_38_0
-$(PKG)_SUBDIR  := boost_$($(PKG)_VERSION)
-$(PKG)_FILE    := boost_$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.boost.org/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/boost/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc zlib bzip2 expat
+PKG             := boost
+$(PKG)_VERSION  := 1_38_0
+$(PKG)_CHECKSUM := b32ff8133b0a38a74553c0d33cb1d70b3ce2d8f1
+$(PKG)_SUBDIR   := boost_$($(PKG)_VERSION)
+$(PKG)_FILE     := boost_$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.boost.org/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/boost/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc zlib bzip2 expat
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=7586&package_id=8041' | \
diff --git a/src/bzip2.mk b/src/bzip2.mk
index fbf13869..12b28f4d 100644
--- a/src/bzip2.mk
+++ b/src/bzip2.mk
@@ -1,12 +1,13 @@
 # bzip2
 
-PKG            := bzip2
-$(PKG)_VERSION := 1.0.5
-$(PKG)_SUBDIR  := bzip2-$($(PKG)_VERSION)
-$(PKG)_FILE    := bzip2-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.bzip.org/
-$(PKG)_URL     := http://www.bzip.org/$($(PKG)_VERSION)/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := bzip2
+$(PKG)_VERSION  := 1.0.5
+$(PKG)_CHECKSUM := 8b02713ea0c8eb501cc8bdac4432d7f29700f767
+$(PKG)_SUBDIR   := bzip2-$($(PKG)_VERSION)
+$(PKG)_FILE     := bzip2-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.bzip.org/
+$(PKG)_URL      := http://www.bzip.org/$($(PKG)_VERSION)/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.bzip.org/downloads.html' | \
diff --git a/src/cairo.mk b/src/cairo.mk
index 4feb41c0..bcc960d8 100644
--- a/src/cairo.mk
+++ b/src/cairo.mk
@@ -1,12 +1,13 @@
 # cairo
 
-PKG            := cairo
-$(PKG)_VERSION := 1.8.6
-$(PKG)_SUBDIR  := cairo-$($(PKG)_VERSION)
-$(PKG)_FILE    := cairo-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://cairographics.org/
-$(PKG)_URL     := http://cairographics.org/releases/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc zlib libpng fontconfig freetype pixman
+PKG             := cairo
+$(PKG)_VERSION  := 1.8.6
+$(PKG)_CHECKSUM := d1e5479d4eeb7b1a3589672e3ef8f4899e7c5eba
+$(PKG)_SUBDIR   := cairo-$($(PKG)_VERSION)
+$(PKG)_FILE     := cairo-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://cairographics.org/
+$(PKG)_URL      := http://cairographics.org/releases/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc zlib libpng fontconfig freetype pixman
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://cairographics.org/releases/' | \
diff --git a/src/curl.mk b/src/curl.mk
index b0baf8aa..7453951c 100644
--- a/src/curl.mk
+++ b/src/curl.mk
@@ -1,12 +1,13 @@
 # cURL
 
-PKG            := curl
-$(PKG)_VERSION := 7.19.4
-$(PKG)_SUBDIR  := curl-$($(PKG)_VERSION)
-$(PKG)_FILE    := curl-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://curl.haxx.se/libcurl/
-$(PKG)_URL     := http://curl.haxx.se/download/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc gnutls libidn
+PKG             := curl
+$(PKG)_VERSION  := 7.19.4
+$(PKG)_CHECKSUM := 6b8cb206990cd68d8653cea16a47bd0febd5c50d
+$(PKG)_SUBDIR   := curl-$($(PKG)_VERSION)
+$(PKG)_FILE     := curl-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://curl.haxx.se/libcurl/
+$(PKG)_URL      := http://curl.haxx.se/download/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc gnutls libidn
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://curl.haxx.se/changes.html' | \
diff --git a/src/expat.mk b/src/expat.mk
index 568b3ac6..b35d33a4 100644
--- a/src/expat.mk
+++ b/src/expat.mk
@@ -1,12 +1,13 @@
 # Expat XML Parser
 
-PKG            := expat
-$(PKG)_VERSION := 2.0.1
-$(PKG)_SUBDIR  := expat-$($(PKG)_VERSION)
-$(PKG)_FILE    := expat-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://expat.sourceforge.net/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/expat/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := expat
+$(PKG)_VERSION  := 2.0.1
+$(PKG)_CHECKSUM := 663548c37b996082db1f2f2c32af060d7aa15c2d
+$(PKG)_SUBDIR   := expat-$($(PKG)_VERSION)
+$(PKG)_FILE     := expat-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://expat.sourceforge.net/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/expat/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=10127&package_id=10780' | \
diff --git a/src/fltk.mk b/src/fltk.mk
index a4de84d9..a068f401 100644
--- a/src/fltk.mk
+++ b/src/fltk.mk
@@ -1,12 +1,13 @@
 # FLTK
 
-PKG            := fltk
-$(PKG)_VERSION := 1.1.9
-$(PKG)_SUBDIR  := fltk-$($(PKG)_VERSION)
-$(PKG)_FILE    := fltk-$($(PKG)_VERSION)-source.tar.bz2
-$(PKG)_WEBSITE := http://www.fltk.org/
-$(PKG)_URL     := http://ftp.easysw.com/pub/fltk/$($(PKG)_VERSION)/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc pthreads zlib jpeg libpng
+PKG             := fltk
+$(PKG)_VERSION  := 1.1.9
+$(PKG)_CHECKSUM := 6f21903dc53c829ec71e8e49655eb19e624c8247
+$(PKG)_SUBDIR   := fltk-$($(PKG)_VERSION)
+$(PKG)_FILE     := fltk-$($(PKG)_VERSION)-source.tar.bz2
+$(PKG)_WEBSITE  := http://www.fltk.org/
+$(PKG)_URL      := http://ftp.easysw.com/pub/fltk/$($(PKG)_VERSION)/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc pthreads zlib jpeg libpng
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.fltk.org/' | \
diff --git a/src/fontconfig.mk b/src/fontconfig.mk
index 15728b57..bcc31532 100644
--- a/src/fontconfig.mk
+++ b/src/fontconfig.mk
@@ -1,12 +1,13 @@
 # fontconfig
 
-PKG            := fontconfig
-$(PKG)_VERSION := 2.6.0
-$(PKG)_SUBDIR  := fontconfig-$($(PKG)_VERSION)
-$(PKG)_FILE    := fontconfig-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://fontconfig.org/
-$(PKG)_URL     := http://fontconfig.org/release/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc freetype expat
+PKG             := fontconfig
+$(PKG)_VERSION  := 2.6.0
+$(PKG)_CHECKSUM := 93752566b8327485b153bd156049614f779b4c57
+$(PKG)_SUBDIR   := fontconfig-$($(PKG)_VERSION)
+$(PKG)_FILE     := fontconfig-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://fontconfig.org/
+$(PKG)_URL      := http://fontconfig.org/release/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc freetype expat
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://fontconfig.org/release/' | \
diff --git a/src/freetype.mk b/src/freetype.mk
index 4f10a0ac..1672a9b4 100644
--- a/src/freetype.mk
+++ b/src/freetype.mk
@@ -1,12 +1,13 @@
 # freetype
 
-PKG            := freetype
-$(PKG)_VERSION := 2.3.9
-$(PKG)_SUBDIR  := freetype-$($(PKG)_VERSION)
-$(PKG)_FILE    := freetype-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://freetype.sourceforge.net/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/freetype/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc zlib
+PKG             := freetype
+$(PKG)_VERSION  := 2.3.9
+$(PKG)_CHECKSUM := db08969cb5053879ff9e973fe6dd2c52c7ea2d4e
+$(PKG)_SUBDIR   := freetype-$($(PKG)_VERSION)
+$(PKG)_FILE     := freetype-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://freetype.sourceforge.net/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/freetype/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc zlib
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=3157&package_id=3121' | \
diff --git a/src/gcc-core.mk b/src/gcc-core.mk
index b736bfbc..6db00d3b 100644
--- a/src/gcc-core.mk
+++ b/src/gcc-core.mk
@@ -1,12 +1,13 @@
 # GCC core
 
-PKG            := gcc-core
-$(PKG)_VERSION := 4.3.3
-$(PKG)_SUBDIR  := gcc-$($(PKG)_VERSION)
-$(PKG)_FILE    := gcc-core-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://gcc.gnu.org/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
-$(PKG)_DEPS    :=
+PKG             := gcc-core
+$(PKG)_VERSION  := 4.3.3
+$(PKG)_CHECKSUM := b907061e5788d7060bfb94396152ba9fc0786f91
+$(PKG)_SUBDIR   := gcc-$($(PKG)_VERSION)
+$(PKG)_FILE     := gcc-core-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://gcc.gnu.org/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
+$(PKG)_DEPS     :=
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=200665&package_id=238462' | \
diff --git a/src/gcc-fortran.mk b/src/gcc-fortran.mk
index e350160b..14a2b08f 100644
--- a/src/gcc-fortran.mk
+++ b/src/gcc-fortran.mk
@@ -1,12 +1,13 @@
 # GCC fortran
 
-PKG            := gcc-fortran
-$(PKG)_VERSION := 4.3.3
-$(PKG)_SUBDIR  := gcc-$($(PKG)_VERSION)
-$(PKG)_FILE    := gcc-fortran-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://gcc.gnu.org/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
-$(PKG)_DEPS    :=
+PKG             := gcc-fortran
+$(PKG)_VERSION  := 4.3.3
+$(PKG)_CHECKSUM := 14d8a5974fa16dcd5a9e2452db7fa9afc46b3be4
+$(PKG)_SUBDIR   := gcc-$($(PKG)_VERSION)
+$(PKG)_FILE     := gcc-fortran-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://gcc.gnu.org/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
+$(PKG)_DEPS     :=
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=200665&package_id=238462' | \
diff --git a/src/gcc-g++.mk b/src/gcc-g++.mk
index 57bb7f62..fd3a1f56 100644
--- a/src/gcc-g++.mk
+++ b/src/gcc-g++.mk
@@ -1,12 +1,13 @@
 # GCC g++
 
-PKG            := gcc-g++
-$(PKG)_VERSION := 4.3.3
-$(PKG)_SUBDIR  := gcc-$($(PKG)_VERSION)
-$(PKG)_FILE    := gcc-g++-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://gcc.gnu.org/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
-$(PKG)_DEPS    :=
+PKG             := gcc-g++
+$(PKG)_VERSION  := 4.3.3
+$(PKG)_CHECKSUM := cb41dc7f52a23167b1dfdadadd437bbecb1dce05
+$(PKG)_SUBDIR   := gcc-$($(PKG)_VERSION)
+$(PKG)_FILE     := gcc-g++-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://gcc.gnu.org/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
+$(PKG)_DEPS     :=
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=200665&package_id=238462' | \
diff --git a/src/gcc-gmp.mk b/src/gcc-gmp.mk
index ccdb121a..af643f99 100644
--- a/src/gcc-gmp.mk
+++ b/src/gcc-gmp.mk
@@ -1,12 +1,13 @@
 # GMP for GCC
 
-PKG            := gcc-gmp
-$(PKG)_VERSION := 4.2.4
-$(PKG)_SUBDIR  := gmp-$($(PKG)_VERSION)
-$(PKG)_FILE    := gmp-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.gmplib.org/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
-$(PKG)_DEPS    :=
+PKG             := gcc-gmp
+$(PKG)_VERSION  := 4.2.4
+$(PKG)_CHECKSUM := bb721f94fbeeb8c609104540b408da6707c370ec
+$(PKG)_SUBDIR   := gmp-$($(PKG)_VERSION)
+$(PKG)_FILE     := gmp-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.gmplib.org/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
+$(PKG)_DEPS     :=
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=200665&package_id=238462' | \
diff --git a/src/gcc-mpfr.mk b/src/gcc-mpfr.mk
index 39d9de8e..91eb4f81 100644
--- a/src/gcc-mpfr.mk
+++ b/src/gcc-mpfr.mk
@@ -1,12 +1,13 @@
 # MPFR for GCC
 
-PKG            := gcc-mpfr
-$(PKG)_VERSION := 2.3.2
-$(PKG)_SUBDIR  := mpfr-$($(PKG)_VERSION)
-$(PKG)_FILE    := mpfr-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.mpfr.org/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
-$(PKG)_DEPS    :=
+PKG             := gcc-mpfr
+$(PKG)_VERSION  := 2.3.2
+$(PKG)_CHECKSUM := 37dbd478e1c136f37cf4c68eb1522e86e2307288
+$(PKG)_SUBDIR   := mpfr-$($(PKG)_VERSION)
+$(PKG)_FILE     := mpfr-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.mpfr.org/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
+$(PKG)_DEPS     :=
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=200665&package_id=238462' | \
diff --git a/src/gcc-objc.mk b/src/gcc-objc.mk
index 2f4dbd5a..5778faa1 100644
--- a/src/gcc-objc.mk
+++ b/src/gcc-objc.mk
@@ -1,12 +1,13 @@
 # GCC objc
 
-PKG            := gcc-objc
-$(PKG)_VERSION := 4.3.3
-$(PKG)_SUBDIR  := gcc-$($(PKG)_VERSION)
-$(PKG)_FILE    := gcc-objc-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://gcc.gnu.org/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
-$(PKG)_DEPS    :=
+PKG             := gcc-objc
+$(PKG)_VERSION  := 4.3.3
+$(PKG)_CHECKSUM := 2459c314ebb9c8661870b42a146def33826cf147
+$(PKG)_SUBDIR   := gcc-$($(PKG)_VERSION)
+$(PKG)_FILE     := gcc-objc-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://gcc.gnu.org/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
+$(PKG)_DEPS     :=
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=200665&package_id=238462' | \
diff --git a/src/gcc.mk b/src/gcc.mk
index c1f93b13..2bcf6933 100644
--- a/src/gcc.mk
+++ b/src/gcc.mk
@@ -1,12 +1,13 @@
 # TDM-GCC
 
-PKG            := gcc
-$(PKG)_VERSION := 4.3.3-tdm-1
-$(PKG)_SUBDIR  := .
-$(PKG)_FILE    := gcc-$($(PKG)_VERSION)-srcbase.zip
-$(PKG)_WEBSITE := http://www.tdragon.net/recentgcc/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
-$(PKG)_DEPS    := pkg_config mingwrt w32api binutils gcc-gmp gcc-mpfr gcc-core gcc-g++ gcc-objc gcc-fortran
+PKG             := gcc
+$(PKG)_VERSION  := 4.3.3-tdm-1
+$(PKG)_CHECKSUM := 74a2f7867e27e414ffd5973fe6e70c8ac0f9d53c
+$(PKG)_SUBDIR   := .
+$(PKG)_FILE     := gcc-$($(PKG)_VERSION)-srcbase.zip
+$(PKG)_WEBSITE  := http://www.tdragon.net/recentgcc/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/tdm-gcc/$($(PKG)_FILE)
+$(PKG)_DEPS     := pkg_config mingwrt w32api binutils gcc-gmp gcc-mpfr gcc-core gcc-g++ gcc-objc gcc-fortran
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=200665&package_id=238347' | \
diff --git a/src/gd.mk b/src/gd.mk
index e6bfa95e..37ac0712 100644
--- a/src/gd.mk
+++ b/src/gd.mk
@@ -1,13 +1,14 @@
 # GD  (without support for xpm)
 
-PKG            := gd
-$(PKG)_VERSION := 2.0.35
-$(PKG)_SUBDIR  := gd-$($(PKG)_VERSION)
-$(PKG)_FILE    := gd-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.libgd.org/
-$(PKG)_URL     := http://www.libgd.org/releases/$($(PKG)_FILE)
-$(PKG)_URL_2   := http://www.libgd.org/releases/oldreleases/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc freetype libpng libxml2
+PKG             := gd
+$(PKG)_VERSION  := 2.0.35
+$(PKG)_CHECKSUM := ccf34a610abff2dbf133a20c4d2a4aa94939018a
+$(PKG)_SUBDIR   := gd-$($(PKG)_VERSION)
+$(PKG)_FILE     := gd-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.libgd.org/
+$(PKG)_URL      := http://www.libgd.org/releases/$($(PKG)_FILE)
+$(PKG)_URL_2    := http://www.libgd.org/releases/oldreleases/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc freetype libpng libxml2
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.libgd.org/releases/' | \
diff --git a/src/gdal.mk b/src/gdal.mk
index 4e338816..35679b08 100644
--- a/src/gdal.mk
+++ b/src/gdal.mk
@@ -1,12 +1,13 @@
 # GDAL
 
-PKG            := gdal
-$(PKG)_VERSION := 1.6.0
-$(PKG)_SUBDIR  := gdal-$($(PKG)_VERSION)
-$(PKG)_FILE    := gdal-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.gdal.org/
-$(PKG)_URL     := http://download.osgeo.org/gdal/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc zlib libpng tiff libgeotiff jpeg giflib expat curl geos
+PKG             := gdal
+$(PKG)_VERSION  := 1.6.0
+$(PKG)_CHECKSUM := cae5a891231ee5794350d1626a688d802a429423
+$(PKG)_SUBDIR   := gdal-$($(PKG)_VERSION)
+$(PKG)_FILE     := gdal-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.gdal.org/
+$(PKG)_URL      := http://download.osgeo.org/gdal/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc zlib libpng tiff libgeotiff jpeg giflib expat curl geos
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://trac.osgeo.org/gdal/wiki/DownloadSource' | \
diff --git a/src/geos.mk b/src/geos.mk
index 074b27f7..d00a729a 100644
--- a/src/geos.mk
+++ b/src/geos.mk
@@ -1,12 +1,13 @@
 # GEOS
 
-PKG            := geos
-$(PKG)_VERSION := 3.1.0
-$(PKG)_SUBDIR  := geos-$($(PKG)_VERSION)
-$(PKG)_FILE    := geos-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://trac.osgeo.org/geos/
-$(PKG)_URL     := http://download.osgeo.org/geos/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := geos
+$(PKG)_VERSION  := 3.1.0
+$(PKG)_CHECKSUM := a36b462e4afac91d7aacef9944bff0706ea64168
+$(PKG)_SUBDIR   := geos-$($(PKG)_VERSION)
+$(PKG)_FILE     := geos-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://trac.osgeo.org/geos/
+$(PKG)_URL      := http://download.osgeo.org/geos/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://geos.refractions.net/' | \
diff --git a/src/gettext.mk b/src/gettext.mk
index d3aac521..ee0d5608 100644
--- a/src/gettext.mk
+++ b/src/gettext.mk
@@ -1,12 +1,13 @@
 # gettext
 
-PKG            := gettext
-$(PKG)_VERSION := 0.17
-$(PKG)_SUBDIR  := gettext-$($(PKG)_VERSION)
-$(PKG)_FILE    := gettext-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.gnu.org/software/gettext/
-$(PKG)_URL     := ftp://ftp.gnu.org/pub/gnu/gettext/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc libiconv
+PKG             := gettext
+$(PKG)_VERSION  := 0.17
+$(PKG)_CHECKSUM := c51803d9f745f6ace36bd09c0486d5735ce399cf
+$(PKG)_SUBDIR   := gettext-$($(PKG)_VERSION)
+$(PKG)_FILE     := gettext-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.gnu.org/software/gettext/
+$(PKG)_URL      := ftp://ftp.gnu.org/pub/gnu/gettext/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc libiconv
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.gnu.org/software/gettext/' | \
diff --git a/src/giflib.mk b/src/giflib.mk
index 9b3d2f68..7c10f575 100644
--- a/src/giflib.mk
+++ b/src/giflib.mk
@@ -1,12 +1,13 @@
 # giflib
 
-PKG            := giflib
-$(PKG)_VERSION := 4.1.6
-$(PKG)_SUBDIR  := giflib-$($(PKG)_VERSION)
-$(PKG)_FILE    := giflib-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://sourceforge.net/projects/libungif/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/giflib/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := giflib
+$(PKG)_VERSION  := 4.1.6
+$(PKG)_CHECKSUM := 22680f604ec92065f04caf00b1c180ba74fb8562
+$(PKG)_SUBDIR   := giflib-$($(PKG)_VERSION)
+$(PKG)_FILE     := giflib-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://sourceforge.net/projects/libungif/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/giflib/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=102202&package_id=119585' | \
diff --git a/src/glew.mk b/src/glew.mk
index e03ed5d3..45410275 100644
--- a/src/glew.mk
+++ b/src/glew.mk
@@ -1,12 +1,13 @@
 # GLEW
 
-PKG            := glew
-$(PKG)_VERSION := 1.5.1
-$(PKG)_SUBDIR  := glew
-$(PKG)_FILE    := glew-$($(PKG)_VERSION)-src.tgz
-$(PKG)_WEBSITE := http://glew.sourceforge.net/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/glew/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := glew
+$(PKG)_VERSION  := 1.5.1
+$(PKG)_CHECKSUM := a94113169d46487ccda1bb2fde68fa1803bdf009
+$(PKG)_SUBDIR   := glew
+$(PKG)_FILE     := glew-$($(PKG)_VERSION)-src.tgz
+$(PKG)_WEBSITE  := http://glew.sourceforge.net/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/glew/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=67586&package_id=67942' | \
diff --git a/src/glib.mk b/src/glib.mk
index fc308ba9..bc7bf1c3 100644
--- a/src/glib.mk
+++ b/src/glib.mk
@@ -1,12 +1,13 @@
 # GLib
 
-PKG            := glib
-$(PKG)_VERSION := 2.20.0
-$(PKG)_SUBDIR  := glib-$($(PKG)_VERSION)
-$(PKG)_FILE    := glib-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.gtk.org/
-$(PKG)_URL     := http://ftp.gnome.org/pub/gnome/sources/glib/$(call SHORT_PKG_VERSION,$(PKG))/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc gettext pcre libiconv
+PKG             := glib
+$(PKG)_VERSION  := 2.20.0
+$(PKG)_CHECKSUM := 4d653ef39fd1ebe7b64217fd824dfb1bbbde7007
+$(PKG)_SUBDIR   := glib-$($(PKG)_VERSION)
+$(PKG)_FILE     := glib-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.gtk.org/
+$(PKG)_URL      := http://ftp.gnome.org/pub/gnome/sources/glib/$(call SHORT_PKG_VERSION,$(PKG))/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc gettext pcre libiconv
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.gtk.org/download-windows.html' | \
diff --git a/src/gnutls.mk b/src/gnutls.mk
index 83dd24f5..17c63ef7 100644
--- a/src/gnutls.mk
+++ b/src/gnutls.mk
@@ -1,13 +1,14 @@
 # GnuTLS
 
-PKG            := gnutls
-$(PKG)_VERSION := 2.6.4
-$(PKG)_SUBDIR  := gnutls-$($(PKG)_VERSION)
-$(PKG)_FILE    := gnutls-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.gnu.org/software/gnutls/
-$(PKG)_URL     := ftp://ftp.gnu.org/pub/gnu/gnutls/$($(PKG)_FILE)
-$(PKG)_URL_2   := ftp://ftp.gnupg.org/gcrypt/gnutls/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc libgcrypt
+PKG             := gnutls
+$(PKG)_VERSION  := 2.6.4
+$(PKG)_CHECKSUM := 11dd1e11599906a32b3ff92308f4c4dbaadbad58
+$(PKG)_SUBDIR   := gnutls-$($(PKG)_VERSION)
+$(PKG)_FILE     := gnutls-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.gnu.org/software/gnutls/
+$(PKG)_URL      := ftp://ftp.gnu.org/pub/gnu/gnutls/$($(PKG)_FILE)
+$(PKG)_URL_2    := ftp://ftp.gnupg.org/gcrypt/gnutls/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc libgcrypt
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://git.savannah.gnu.org/gitweb/?p=gnutls.git;a=tags' | \
diff --git a/src/gtk.mk b/src/gtk.mk
index 30b3f181..b3bbcfe4 100644
--- a/src/gtk.mk
+++ b/src/gtk.mk
@@ -1,12 +1,13 @@
 # GTK+
 
-PKG            := gtk
-$(PKG)_VERSION := 2.16.0
-$(PKG)_SUBDIR  := gtk+-$($(PKG)_VERSION)
-$(PKG)_FILE    := gtk+-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.gtk.org/
-$(PKG)_URL     := http://ftp.gnome.org/pub/gnome/sources/gtk+/$(call SHORT_PKG_VERSION,$(PKG))/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc gettext libpng jpeg tiff jasper glib atk pango cairo
+PKG             := gtk
+$(PKG)_VERSION  := 2.16.0
+$(PKG)_CHECKSUM := b737ad4b224a3cff966ef43b2682c696d756764c
+$(PKG)_SUBDIR   := gtk+-$($(PKG)_VERSION)
+$(PKG)_FILE     := gtk+-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.gtk.org/
+$(PKG)_URL      := http://ftp.gnome.org/pub/gnome/sources/gtk+/$(call SHORT_PKG_VERSION,$(PKG))/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc gettext libpng jpeg tiff jasper glib atk pango cairo
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.gtk.org/download-windows.html' | \
diff --git a/src/ilmbase.mk b/src/ilmbase.mk
index fc588eee..875d5a08 100644
--- a/src/ilmbase.mk
+++ b/src/ilmbase.mk
@@ -1,12 +1,13 @@
 # IlmBase
 
-PKG            := ilmbase
-$(PKG)_VERSION := 1.0.1
-$(PKG)_SUBDIR  := ilmbase-$($(PKG)_VERSION)
-$(PKG)_FILE    := ilmbase-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.openexr.com/
-$(PKG)_URL     := http://download.savannah.nongnu.org/releases/openexr/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := ilmbase
+$(PKG)_VERSION  := 1.0.1
+$(PKG)_CHECKSUM := 143adc547be83c6df75831ae957eef4b2706c9c0
+$(PKG)_SUBDIR   := ilmbase-$($(PKG)_VERSION)
+$(PKG)_FILE     := ilmbase-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.openexr.com/
+$(PKG)_URL      := http://download.savannah.nongnu.org/releases/openexr/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.openexr.com/downloads.html' | \
diff --git a/src/jasper.mk b/src/jasper.mk
index 83c89443..8d9b43fc 100644
--- a/src/jasper.mk
+++ b/src/jasper.mk
@@ -1,12 +1,13 @@
 # JasPer
 
-PKG            := jasper
-$(PKG)_VERSION := 1.900.1
-$(PKG)_SUBDIR  := jasper-$($(PKG)_VERSION)
-$(PKG)_FILE    := jasper-$($(PKG)_VERSION).zip
-$(PKG)_WEBSITE := http://www.ece.uvic.ca/~mdadams/jasper/
-$(PKG)_URL     := http://www.ece.uvic.ca/~mdadams/jasper/software/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc jpeg
+PKG             := jasper
+$(PKG)_VERSION  := 1.900.1
+$(PKG)_CHECKSUM := 9c5735f773922e580bf98c7c7dfda9bbed4c5191
+$(PKG)_SUBDIR   := jasper-$($(PKG)_VERSION)
+$(PKG)_FILE     := jasper-$($(PKG)_VERSION).zip
+$(PKG)_WEBSITE  := http://www.ece.uvic.ca/~mdadams/jasper/
+$(PKG)_URL      := http://www.ece.uvic.ca/~mdadams/jasper/software/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc jpeg
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.ece.uvic.ca/~mdadams/jasper/' | \
diff --git a/src/jpeg.mk b/src/jpeg.mk
index fcf2bb6c..f275fe50 100644
--- a/src/jpeg.mk
+++ b/src/jpeg.mk
@@ -1,13 +1,14 @@
 # jpeg
 # http://packages.debian.org/unstable/source/libjpeg6b
 
-PKG            := jpeg
-$(PKG)_VERSION := 6b
-$(PKG)_SUBDIR  := jpeg-$($(PKG)_VERSION)
-$(PKG)_WEBSITE := http://www.ijg.org/
-$(PKG)_FILE    := libjpeg6b_$($(PKG)_VERSION).orig.tar.gz
-$(PKG)_URL     := http://ftp.debian.org/debian/pool/main/libj/libjpeg6b/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := jpeg
+$(PKG)_VERSION  := 6b
+$(PKG)_CHECKSUM := 7079f0d6c42fad0cfba382cf6ad322add1ace8f9
+$(PKG)_SUBDIR   := jpeg-$($(PKG)_VERSION)
+$(PKG)_WEBSITE  := http://www.ijg.org/
+$(PKG)_FILE     := libjpeg6b_$($(PKG)_VERSION).orig.tar.gz
+$(PKG)_URL      := http://ftp.debian.org/debian/pool/main/libj/libjpeg6b/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://packages.debian.org/unstable/source/libjpeg6b' | \
diff --git a/src/libdnet.mk b/src/libdnet.mk
index efd98c94..8473a5fc 100644
--- a/src/libdnet.mk
+++ b/src/libdnet.mk
@@ -1,12 +1,13 @@
 # libdnet
 
-PKG            := libdnet
-$(PKG)_VERSION := 1.11
-$(PKG)_SUBDIR  := libdnet-$($(PKG)_VERSION)
-$(PKG)_FILE    := libdnet-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://libdnet.sourceforge.net/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/libdnet/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc winpcap
+PKG             := libdnet
+$(PKG)_VERSION  := 1.11
+$(PKG)_CHECKSUM := e2ae8c7f0ca95655ae9f77fd4a0e2235dc4716bf
+$(PKG)_SUBDIR   := libdnet-$($(PKG)_VERSION)
+$(PKG)_FILE     := libdnet-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://libdnet.sourceforge.net/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/libdnet/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc winpcap
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=36243&package_id=28560' | \
diff --git a/src/libgcrypt.mk b/src/libgcrypt.mk
index 9fa0b7c1..e2d9bfc3 100644
--- a/src/libgcrypt.mk
+++ b/src/libgcrypt.mk
@@ -1,12 +1,13 @@
 # libgcrypt
 
-PKG            := libgcrypt
-$(PKG)_VERSION := 1.4.4
-$(PKG)_SUBDIR  := libgcrypt-$($(PKG)_VERSION)
-$(PKG)_FILE    := libgcrypt-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := ftp://ftp.gnupg.org/gcrypt/libgcrypt/
-$(PKG)_URL     := ftp://ftp.gnupg.org/gcrypt/libgcrypt/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc libgpg_error
+PKG             := libgcrypt
+$(PKG)_VERSION  := 1.4.4
+$(PKG)_CHECKSUM := 3987f0efcbb7048c136d5c859e88eee1763a14f6
+$(PKG)_SUBDIR   := libgcrypt-$($(PKG)_VERSION)
+$(PKG)_FILE     := libgcrypt-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := ftp://ftp.gnupg.org/gcrypt/libgcrypt/
+$(PKG)_URL      := ftp://ftp.gnupg.org/gcrypt/libgcrypt/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc libgpg_error
 
 define $(PKG)_UPDATE
     wget -q -O- 'ftp://ftp.gnupg.org/gcrypt/libgcrypt/' | \
diff --git a/src/libgeotiff.mk b/src/libgeotiff.mk
index 76d9de8f..fdcf7526 100644
--- a/src/libgeotiff.mk
+++ b/src/libgeotiff.mk
@@ -1,13 +1,14 @@
 # GeoTiff
 
-PKG            := libgeotiff
-$(PKG)_VERSION := 1.2.5
-$(PKG)_SUBDIR  := libgeotiff-$($(PKG)_VERSION)
-$(PKG)_FILE    := libgeotiff-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://trac.osgeo.org/geotiff/
-$(PKG)_URL     := http://download.osgeo.org/geotiff/libgeotiff/$($(PKG)_FILE)
-$(PKG)_URL_2   := ftp://ftp.remotesensing.org/pub/geotiff/libgeotiff/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc zlib jpeg tiff proj
+PKG             := libgeotiff
+$(PKG)_VERSION  := 1.2.5
+$(PKG)_CHECKSUM := 38b10070374636fedfdde328ff1c9f3c6e8e581f
+$(PKG)_SUBDIR   := libgeotiff-$($(PKG)_VERSION)
+$(PKG)_FILE     := libgeotiff-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://trac.osgeo.org/geotiff/
+$(PKG)_URL      := http://download.osgeo.org/geotiff/libgeotiff/$($(PKG)_FILE)
+$(PKG)_URL_2    := ftp://ftp.remotesensing.org/pub/geotiff/libgeotiff/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc zlib jpeg tiff proj
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://trac.osgeo.org/geotiff/' | \
diff --git a/src/libgpg_error.mk b/src/libgpg_error.mk
index 9d08c4cc..a03816d8 100644
--- a/src/libgpg_error.mk
+++ b/src/libgpg_error.mk
@@ -1,12 +1,13 @@
 # libgpg-error
 
-PKG            := libgpg_error
-$(PKG)_VERSION := 1.7
-$(PKG)_SUBDIR  := libgpg-error-$($(PKG)_VERSION)
-$(PKG)_FILE    := libgpg-error-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := ftp://ftp.gnupg.org/gcrypt/libgpg-error/
-$(PKG)_URL     := ftp://ftp.gnupg.org/gcrypt/libgpg-error/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := libgpg_error
+$(PKG)_VERSION  := 1.7
+$(PKG)_CHECKSUM := bf8c6babe1e28cae7dd6374ca24ddcc42d57e902
+$(PKG)_SUBDIR   := libgpg-error-$($(PKG)_VERSION)
+$(PKG)_FILE     := libgpg-error-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := ftp://ftp.gnupg.org/gcrypt/libgpg-error/
+$(PKG)_URL      := ftp://ftp.gnupg.org/gcrypt/libgpg-error/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'ftp://ftp.gnupg.org/gcrypt/libgpg-error/' | \
diff --git a/src/libgsasl.mk b/src/libgsasl.mk
index 8a9ab040..f11fba05 100644
--- a/src/libgsasl.mk
+++ b/src/libgsasl.mk
@@ -1,12 +1,13 @@
 # Libgsasl
 
-PKG            := libgsasl
-$(PKG)_VERSION := 1.1
-$(PKG)_SUBDIR  := libgsasl-$($(PKG)_VERSION)
-$(PKG)_FILE    := libgsasl-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.gnu.org/software/gsasl/
-$(PKG)_URL     := http://ftp.gnu.org/gnu/gsasl/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc libiconv libidn libntlm
+PKG             := libgsasl
+$(PKG)_VERSION  := 1.1
+$(PKG)_CHECKSUM := 6261807a5251eba564175169af0662e6e1583ca7
+$(PKG)_SUBDIR   := libgsasl-$($(PKG)_VERSION)
+$(PKG)_FILE     := libgsasl-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.gnu.org/software/gsasl/
+$(PKG)_URL      := http://ftp.gnu.org/gnu/gsasl/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc libiconv libidn libntlm
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://git.savannah.gnu.org/gitweb/?p=gsasl.git;a=tags' | \
diff --git a/src/libgsf.mk b/src/libgsf.mk
index ea902303..7cce34b3 100644
--- a/src/libgsf.mk
+++ b/src/libgsf.mk
@@ -1,12 +1,13 @@
 # libgsf
 
-PKG            := libgsf
-$(PKG)_VERSION := 1.14.11
-$(PKG)_SUBDIR  := libgsf-$($(PKG)_VERSION)
-$(PKG)_FILE    := libgsf-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://ftp.gnome.org/pub/gnome/sources/libgsf/
-$(PKG)_URL     := http://ftp.gnome.org/pub/gnome/sources/libgsf/$(call SHORT_PKG_VERSION,$(PKG))/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc zlib bzip2 glib libxml2
+PKG             := libgsf
+$(PKG)_VERSION  := 1.14.11
+$(PKG)_CHECKSUM := 9f097ba5e3d538f6810ae27941a918964aea1de9
+$(PKG)_SUBDIR   := libgsf-$($(PKG)_VERSION)
+$(PKG)_FILE     := libgsf-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://ftp.gnome.org/pub/gnome/sources/libgsf/
+$(PKG)_URL      := http://ftp.gnome.org/pub/gnome/sources/libgsf/$(call SHORT_PKG_VERSION,$(PKG))/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc zlib bzip2 glib libxml2
 
 define $(PKG)_UPDATE
     wget -q -O- -U 'mingw_cross_env' 'http://freshmeat.net/projects/libgsf/' | \
diff --git a/src/libiconv.mk b/src/libiconv.mk
index 0cf0b740..cf25c76e 100644
--- a/src/libiconv.mk
+++ b/src/libiconv.mk
@@ -1,12 +1,13 @@
 # libiconv
 
-PKG            := libiconv
-$(PKG)_VERSION := 1.12
-$(PKG)_SUBDIR  := libiconv-$($(PKG)_VERSION)
-$(PKG)_FILE    := libiconv-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.gnu.org/software/libiconv/
-$(PKG)_URL     := http://ftp.gnu.org/pub/gnu/libiconv/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := libiconv
+$(PKG)_VERSION  := 1.12
+$(PKG)_CHECKSUM := a5738d7dfbbd01c49e8ce026ea4ffa0f01af0179
+$(PKG)_SUBDIR   := libiconv-$($(PKG)_VERSION)
+$(PKG)_FILE     := libiconv-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.gnu.org/software/libiconv/
+$(PKG)_URL      := http://ftp.gnu.org/pub/gnu/libiconv/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.gnu.org/software/libiconv/' | \
diff --git a/src/libidn.mk b/src/libidn.mk
index f739fea8..79f1034b 100644
--- a/src/libidn.mk
+++ b/src/libidn.mk
@@ -1,12 +1,13 @@
 # Libidn
 
-PKG            := libidn
-$(PKG)_VERSION := 1.14
-$(PKG)_SUBDIR  := libidn-$($(PKG)_VERSION)
-$(PKG)_FILE    := libidn-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.gnu.org/software/libidn/
-$(PKG)_URL     := ftp://ftp.gnu.org/gnu/libidn/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc libiconv
+PKG             := libidn
+$(PKG)_VERSION  := 1.14
+$(PKG)_CHECKSUM := ab68746b9c74f07605b6b0ee13dc0b4b7b8101a8
+$(PKG)_SUBDIR   := libidn-$($(PKG)_VERSION)
+$(PKG)_FILE     := libidn-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.gnu.org/software/libidn/
+$(PKG)_URL      := ftp://ftp.gnu.org/gnu/libidn/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc libiconv
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://git.savannah.gnu.org/gitweb/?p=libidn.git;a=tags' | \
diff --git a/src/libmikmod.mk b/src/libmikmod.mk
index 6d7b1a71..3c709e52 100644
--- a/src/libmikmod.mk
+++ b/src/libmikmod.mk
@@ -1,12 +1,13 @@
 # libMikMod
 
-PKG            := libmikmod
-$(PKG)_VERSION := 3.2.0-beta2
-$(PKG)_SUBDIR  := libmikmod-$($(PKG)_VERSION)
-$(PKG)_FILE    := libmikmod-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://mikmod.raphnet.net/
-$(PKG)_URL     := http://mikmod.raphnet.net/files/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc pthreads
+PKG             := libmikmod
+$(PKG)_VERSION  := 3.2.0-beta2
+$(PKG)_CHECKSUM := f16fc09ee643af295a8642f578bda97a81aaf744
+$(PKG)_SUBDIR   := libmikmod-$($(PKG)_VERSION)
+$(PKG)_FILE     := libmikmod-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://mikmod.raphnet.net/
+$(PKG)_URL      := http://mikmod.raphnet.net/files/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc pthreads
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://mikmod.raphnet.net/' | \
diff --git a/src/libntlm.mk b/src/libntlm.mk
index bde99e8c..05dfdce3 100644
--- a/src/libntlm.mk
+++ b/src/libntlm.mk
@@ -1,12 +1,13 @@
 # Libntlm
 
-PKG            := libntlm
-$(PKG)_VERSION := 1.0
-$(PKG)_SUBDIR  := libntlm-$($(PKG)_VERSION)
-$(PKG)_FILE    := libntlm-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://josefsson.org/libntlm/
-$(PKG)_URL     := http://josefsson.org/libntlm/releases/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := libntlm
+$(PKG)_VERSION  := 1.0
+$(PKG)_CHECKSUM := c6b351f2c0e5b999204d429c743d0005ba927fa4
+$(PKG)_SUBDIR   := libntlm-$($(PKG)_VERSION)
+$(PKG)_FILE     := libntlm-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://josefsson.org/libntlm/
+$(PKG)_URL      := http://josefsson.org/libntlm/releases/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://git.savannah.gnu.org/gitweb/?p=libntlm.git;a=tags' | \
diff --git a/src/libpng.mk b/src/libpng.mk
index dea89f79..c03c789c 100644
--- a/src/libpng.mk
+++ b/src/libpng.mk
@@ -1,12 +1,13 @@
 # libpng
 
-PKG            := libpng
-$(PKG)_VERSION := 1.2.35
-$(PKG)_SUBDIR  := libpng-$($(PKG)_VERSION)
-$(PKG)_FILE    := libpng-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.libpng.org/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/libpng/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc zlib
+PKG             := libpng
+$(PKG)_VERSION  := 1.2.35
+$(PKG)_CHECKSUM := aad4faf21a1fc5853a55a2ff51351707bde3f6ac
+$(PKG)_SUBDIR   := libpng-$($(PKG)_VERSION)
+$(PKG)_FILE     := libpng-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.libpng.org/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/libpng/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc zlib
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=5624' | \
diff --git a/src/libxml2.mk b/src/libxml2.mk
index 0622fcea..5f004a36 100644
--- a/src/libxml2.mk
+++ b/src/libxml2.mk
@@ -1,12 +1,13 @@
 # libxml2
 
-PKG            := libxml2
-$(PKG)_VERSION := 2.7.3
-$(PKG)_SUBDIR  := libxml2-$($(PKG)_VERSION)
-$(PKG)_FILE    := libxml2-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.xmlsoft.org/
-$(PKG)_URL     := ftp://xmlsoft.org/libxml2/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := libxml2
+$(PKG)_VERSION  := 2.7.3
+$(PKG)_CHECKSUM := fd4e427fb55c977876bc74c0e552ef7d3d794a07
+$(PKG)_SUBDIR   := libxml2-$($(PKG)_VERSION)
+$(PKG)_FILE     := libxml2-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.xmlsoft.org/
+$(PKG)_URL      := ftp://xmlsoft.org/libxml2/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'ftp://xmlsoft.org/libxml2/' | \
diff --git a/src/libxslt.mk b/src/libxslt.mk
index 44f5dba5..7e49b90f 100644
--- a/src/libxslt.mk
+++ b/src/libxslt.mk
@@ -1,12 +1,13 @@
 # libxslt
 
-PKG            := libxslt
-$(PKG)_VERSION := 1.1.24
-$(PKG)_SUBDIR  := libxslt-$($(PKG)_VERSION)
-$(PKG)_FILE    := libxslt-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://xmlsoft.org/XSLT/
-$(PKG)_URL     := ftp://xmlsoft.org/libxslt/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc libxml2 libgcrypt
+PKG             := libxslt
+$(PKG)_VERSION  := 1.1.24
+$(PKG)_CHECKSUM := b5402e24abff5545ed76f6a55049cbebc664bd58
+$(PKG)_SUBDIR   := libxslt-$($(PKG)_VERSION)
+$(PKG)_FILE     := libxslt-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://xmlsoft.org/XSLT/
+$(PKG)_URL      := ftp://xmlsoft.org/libxslt/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc libxml2 libgcrypt
 
 define $(PKG)_UPDATE
     wget -q -O- 'ftp://xmlsoft.org/libxslt/' | \
diff --git a/src/lua.mk b/src/lua.mk
index 818ab58a..ca821547 100644
--- a/src/lua.mk
+++ b/src/lua.mk
@@ -1,12 +1,13 @@
 # Lua
 
-PKG            := lua
-$(PKG)_VERSION := 5.1.4
-$(PKG)_SUBDIR  := lua-$($(PKG)_VERSION)
-$(PKG)_FILE    := lua-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.lua.org/
-$(PKG)_URL     := http://www.lua.org/ftp/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := lua
+$(PKG)_VERSION  := 5.1.4
+$(PKG)_CHECKSUM := 2b11c8e60306efb7f0734b747588f57995493db7
+$(PKG)_SUBDIR   := lua-$($(PKG)_VERSION)
+$(PKG)_FILE     := lua-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.lua.org/
+$(PKG)_URL      := http://www.lua.org/ftp/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.lua.org/download.html' | \
diff --git a/src/mingwrt.mk b/src/mingwrt.mk
index c4230ba0..2af2394d 100644
--- a/src/mingwrt.mk
+++ b/src/mingwrt.mk
@@ -1,12 +1,13 @@
 # MinGW Runtime
 
-PKG            := mingwrt
-$(PKG)_VERSION := 3.15.2-mingw32
-$(PKG)_SUBDIR  := .
-$(PKG)_FILE    := mingwrt-$($(PKG)_VERSION)-dev.tar.gz
-$(PKG)_WEBSITE := http://mingw.sourceforge.net/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/mingw/$($(PKG)_FILE)
-$(PKG)_DEPS    :=
+PKG             := mingwrt
+$(PKG)_VERSION  := 3.15.2-mingw32
+$(PKG)_CHECKSUM := 36ef40de84cb8778e68f883d1cf320d9e627342d
+$(PKG)_SUBDIR   := .
+$(PKG)_FILE     := mingwrt-$($(PKG)_VERSION)-dev.tar.gz
+$(PKG)_WEBSITE  := http://mingw.sourceforge.net/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/mingw/$($(PKG)_FILE)
+$(PKG)_DEPS     :=
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=2435&package_id=11598' | \
diff --git a/src/ogg.mk b/src/ogg.mk
index bb3e175d..34382099 100644
--- a/src/ogg.mk
+++ b/src/ogg.mk
@@ -1,12 +1,13 @@
 # OGG
 
-PKG            := ogg
-$(PKG)_VERSION := 1.1.3
-$(PKG)_SUBDIR  := libogg-$($(PKG)_VERSION)
-$(PKG)_FILE    := libogg-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.xiph.org/ogg/
-$(PKG)_URL     := http://downloads.xiph.org/releases/ogg/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := ogg
+$(PKG)_VERSION  := 1.1.3
+$(PKG)_CHECKSUM := a3e495a8baf6939efad7e0bd11cc0e466838c3db
+$(PKG)_SUBDIR   := libogg-$($(PKG)_VERSION)
+$(PKG)_FILE     := libogg-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.xiph.org/ogg/
+$(PKG)_URL      := http://downloads.xiph.org/releases/ogg/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.xiph.org/downloads/' | \
diff --git a/src/old.mk b/src/old.mk
index 7e54b46b..78893fc4 100644
--- a/src/old.mk
+++ b/src/old.mk
@@ -1,12 +1,13 @@
 # old
 
-PKG            := old
-$(PKG)_VERSION := 0.17
-$(PKG)_SUBDIR  := old-$($(PKG)_VERSION)
-$(PKG)_FILE    := old-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://blitiri.com.ar/p/old/
-$(PKG)_URL     := http://blitiri.com.ar/p/old/files/$($(PKG)_VERSION)/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := old
+$(PKG)_VERSION  := 0.17
+$(PKG)_CHECKSUM := d519a8282b0774c344ffeb1b4899f8be53d6d7b3
+$(PKG)_SUBDIR   := old-$($(PKG)_VERSION)
+$(PKG)_FILE     := old-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://blitiri.com.ar/p/old/
+$(PKG)_URL      := http://blitiri.com.ar/p/old/files/$($(PKG)_VERSION)/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://blitiri.com.ar/p/old/' | \
diff --git a/src/openexr.mk b/src/openexr.mk
index 8571ff1a..c067ea71 100644
--- a/src/openexr.mk
+++ b/src/openexr.mk
@@ -1,12 +1,13 @@
 # OpenEXR
 
-PKG            := openexr
-$(PKG)_VERSION := 1.6.1
-$(PKG)_SUBDIR  := openexr-$($(PKG)_VERSION)
-$(PKG)_FILE    := openexr-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.openexr.com/
-$(PKG)_URL     := http://download.savannah.nongnu.org/releases/openexr/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc ilmbase
+PKG             := openexr
+$(PKG)_VERSION  := 1.6.1
+$(PKG)_CHECKSUM := b3650e6542f0e09daadb2d467425530bc8eec333
+$(PKG)_SUBDIR   := openexr-$($(PKG)_VERSION)
+$(PKG)_FILE     := openexr-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.openexr.com/
+$(PKG)_URL      := http://download.savannah.nongnu.org/releases/openexr/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc ilmbase
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.openexr.com/downloads.html' | \
diff --git a/src/pango.mk b/src/pango.mk
index ce701863..8e699614 100644
--- a/src/pango.mk
+++ b/src/pango.mk
@@ -1,12 +1,13 @@
 # Pango
 
-PKG            := pango
-$(PKG)_VERSION := 1.24.0
-$(PKG)_SUBDIR  := pango-$($(PKG)_VERSION)
-$(PKG)_FILE    := pango-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.pango.org/
-$(PKG)_URL     := http://ftp.gnome.org/pub/gnome/sources/pango/$(call SHORT_PKG_VERSION,$(PKG))/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc fontconfig freetype cairo glib
+PKG             := pango
+$(PKG)_VERSION  := 1.24.0
+$(PKG)_CHECKSUM := 32e99f3f1b4ca550225837bf35d581d4d92d08a9
+$(PKG)_SUBDIR   := pango-$($(PKG)_VERSION)
+$(PKG)_FILE     := pango-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.pango.org/
+$(PKG)_URL      := http://ftp.gnome.org/pub/gnome/sources/pango/$(call SHORT_PKG_VERSION,$(PKG))/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc fontconfig freetype cairo glib
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.gtk.org/download-windows.html' | \
diff --git a/src/pcre.mk b/src/pcre.mk
index d4a84051..9fffa00e 100644
--- a/src/pcre.mk
+++ b/src/pcre.mk
@@ -1,12 +1,13 @@
 # PCRE
 
-PKG            := pcre
-$(PKG)_VERSION := 7.8
-$(PKG)_SUBDIR  := pcre-$($(PKG)_VERSION)
-$(PKG)_FILE    := pcre-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.pcre.org/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/pcre/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := pcre
+$(PKG)_VERSION  := 7.8
+$(PKG)_CHECKSUM := 552909f9d18e1954eec639f926957a4cb2de1ec3
+$(PKG)_SUBDIR   := pcre-$($(PKG)_VERSION)
+$(PKG)_FILE     := pcre-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.pcre.org/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/pcre/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=10194&package_id=9960' | \
diff --git a/src/pdcurses.mk b/src/pdcurses.mk
index 6515e557..781b14e2 100644
--- a/src/pdcurses.mk
+++ b/src/pdcurses.mk
@@ -1,12 +1,13 @@
 # PDcurses
 
-PKG            := pdcurses
-$(PKG)_VERSION := 3.4
-$(PKG)_SUBDIR  := PDCurses-$($(PKG)_VERSION)
-$(PKG)_FILE    := PDCurses-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://pdcurses.sourceforge.net/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/pdcurses/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := pdcurses
+$(PKG)_VERSION  := 3.4
+$(PKG)_CHECKSUM := e36684442a6171cc3a5165c8c49c70f67db7288c
+$(PKG)_SUBDIR   := PDCurses-$($(PKG)_VERSION)
+$(PKG)_FILE     := PDCurses-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://pdcurses.sourceforge.net/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/pdcurses/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=30480&package_id=22452' | \
diff --git a/src/pdflib_lite.mk b/src/pdflib_lite.mk
index 7303ca07..dd6dd19a 100644
--- a/src/pdflib_lite.mk
+++ b/src/pdflib_lite.mk
@@ -1,12 +1,13 @@
 # PDFlib Lite
 
-PKG            := pdflib_lite
-$(PKG)_VERSION := 7.0.4
-$(PKG)_SUBDIR  := PDFlib-Lite-$($(PKG)_VERSION)
-$(PKG)_FILE    := PDFlib-Lite-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.pdflib.com/download/pdflib-family/pdflib-lite/
-$(PKG)_URL     := http://www.pdflib.com/binaries/PDFlib/$(subst .,,$($(PKG)_VERSION))/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := pdflib_lite
+$(PKG)_VERSION  := 7.0.4
+$(PKG)_CHECKSUM := bc2fb4639bcb09d319ad7a1141616fcd50a7d7be
+$(PKG)_SUBDIR   := PDFlib-Lite-$($(PKG)_VERSION)
+$(PKG)_FILE     := PDFlib-Lite-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.pdflib.com/download/pdflib-family/pdflib-lite/
+$(PKG)_URL      := http://www.pdflib.com/binaries/PDFlib/$(subst .,,$($(PKG)_VERSION))/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.pdflib.com/download/pdflib-family/pdflib-lite/' | \
diff --git a/src/pixman.mk b/src/pixman.mk
index 3c67a949..828f8a2d 100644
--- a/src/pixman.mk
+++ b/src/pixman.mk
@@ -1,12 +1,13 @@
 # pixman
 
-PKG            := pixman
-$(PKG)_VERSION := 0.14.0
-$(PKG)_SUBDIR  := pixman-$($(PKG)_VERSION)
-$(PKG)_FILE    := pixman-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://cairographics.org/
-$(PKG)_URL     := http://cairographics.org/releases/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := pixman
+$(PKG)_VERSION  := 0.14.0
+$(PKG)_CHECKSUM := 1220f44bfe22cd4ec4cc20d9accb9a809ab8b75c
+$(PKG)_SUBDIR   := pixman-$($(PKG)_VERSION)
+$(PKG)_FILE     := pixman-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://cairographics.org/
+$(PKG)_URL      := http://cairographics.org/releases/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://cairographics.org/releases/' | \
diff --git a/src/pkg_config.mk b/src/pkg_config.mk
index 64f5fd89..341a7b41 100644
--- a/src/pkg_config.mk
+++ b/src/pkg_config.mk
@@ -1,12 +1,13 @@
 # pkg-config
 
-PKG            := pkg_config
-$(PKG)_VERSION := 0.23
-$(PKG)_SUBDIR  := pkg-config-$($(PKG)_VERSION)
-$(PKG)_FILE    := pkg-config-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://pkg-config.freedesktop.org/
-$(PKG)_URL     := http://pkgconfig.freedesktop.org/releases/$($(PKG)_FILE)
-$(PKG)_DEPS    :=
+PKG             := pkg_config
+$(PKG)_VERSION  := 0.23
+$(PKG)_CHECKSUM := b59dddd6b5320bd74c0f74b3339618a327096b2a
+$(PKG)_SUBDIR   := pkg-config-$($(PKG)_VERSION)
+$(PKG)_FILE     := pkg-config-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://pkg-config.freedesktop.org/
+$(PKG)_URL      := http://pkgconfig.freedesktop.org/releases/$($(PKG)_FILE)
+$(PKG)_DEPS     :=
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://pkgconfig.freedesktop.org/' | \
diff --git a/src/proj.mk b/src/proj.mk
index d95cc97f..72730cd0 100644
--- a/src/proj.mk
+++ b/src/proj.mk
@@ -1,13 +1,14 @@
 # proj
 
-PKG            := proj
-$(PKG)_VERSION := 4.6.1
-$(PKG)_SUBDIR  := proj-$($(PKG)_VERSION)
-$(PKG)_FILE    := proj-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://trac.osgeo.org/proj/
-$(PKG)_URL     := http://download.osgeo.org/proj/$($(PKG)_FILE)
-$(PKG)_URL_2   := ftp://ftp.remotesensing.org/proj/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := proj
+$(PKG)_VERSION  := 4.6.1
+$(PKG)_CHECKSUM := ddfdad6cba28af5f91b14fd6690bd22bbbc79390
+$(PKG)_SUBDIR   := proj-$($(PKG)_VERSION)
+$(PKG)_FILE     := proj-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://trac.osgeo.org/proj/
+$(PKG)_URL      := http://download.osgeo.org/proj/$($(PKG)_FILE)
+$(PKG)_URL_2    := ftp://ftp.remotesensing.org/proj/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://trac.osgeo.org/proj/' | \
diff --git a/src/pthreads.mk b/src/pthreads.mk
index 9c875449..0e2ee0b3 100644
--- a/src/pthreads.mk
+++ b/src/pthreads.mk
@@ -1,12 +1,13 @@
 # pthreads-w32
 
-PKG            := pthreads
-$(PKG)_VERSION := 2-8-0
-$(PKG)_SUBDIR  := pthreads-w32-$($(PKG)_VERSION)-release
-$(PKG)_FILE    := pthreads-w32-$($(PKG)_VERSION)-release.tar.gz
-$(PKG)_WEBSITE := http://sourceware.org/pthreads-win32/
-$(PKG)_URL     := ftp://sourceware.org/pub/pthreads-win32/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := pthreads
+$(PKG)_VERSION  := 2-8-0
+$(PKG)_CHECKSUM := da8371cb20e8e238f96a1d0651212f154d84a9ac
+$(PKG)_SUBDIR   := pthreads-w32-$($(PKG)_VERSION)-release
+$(PKG)_FILE     := pthreads-w32-$($(PKG)_VERSION)-release.tar.gz
+$(PKG)_WEBSITE  := http://sourceware.org/pthreads-win32/
+$(PKG)_URL      := ftp://sourceware.org/pub/pthreads-win32/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'ftp://sourceware.org/pub/pthreads-win32/Release_notes' | \
diff --git a/src/sdl.mk b/src/sdl.mk
index e4872c5f..0c6e19e4 100644
--- a/src/sdl.mk
+++ b/src/sdl.mk
@@ -1,12 +1,13 @@
 # SDL
 
-PKG            := sdl
-$(PKG)_VERSION := 1.2.11
-$(PKG)_SUBDIR  := SDL-$($(PKG)_VERSION)
-$(PKG)_FILE    := SDL-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://libsdl.org/
-$(PKG)_URL     := http://libsdl.org/release/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc libiconv
+PKG             := sdl
+$(PKG)_VERSION  := 1.2.11
+$(PKG)_CHECKSUM := 2259134d714e35ab1469d513674a3cd02510d198
+$(PKG)_SUBDIR   := SDL-$($(PKG)_VERSION)
+$(PKG)_FILE     := SDL-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://libsdl.org/
+$(PKG)_URL      := http://libsdl.org/release/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc libiconv
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://libsdl.org/release/changes.html' | \
diff --git a/src/sdl_image.mk b/src/sdl_image.mk
index 5964c47e..268d7304 100644
--- a/src/sdl_image.mk
+++ b/src/sdl_image.mk
@@ -1,12 +1,13 @@
 # SDL_image
 
-PKG            := sdl_image
-$(PKG)_VERSION := 1.2.7
-$(PKG)_SUBDIR  := SDL_image-$($(PKG)_VERSION)
-$(PKG)_FILE    := SDL_image-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://libsdl.org/projects/SDL_image/
-$(PKG)_URL     := http://libsdl.org/projects/SDL_image/release/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc sdl jpeg libpng tiff
+PKG             := sdl_image
+$(PKG)_VERSION  := 1.2.7
+$(PKG)_CHECKSUM := 0cffd05e41014651e7114d7fea309c9f37ef2d8a
+$(PKG)_SUBDIR   := SDL_image-$($(PKG)_VERSION)
+$(PKG)_FILE     := SDL_image-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://libsdl.org/projects/SDL_image/
+$(PKG)_URL      := http://libsdl.org/projects/SDL_image/release/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc sdl jpeg libpng tiff
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://libsdl.org/projects/SDL_image/' | \
diff --git a/src/sdl_mixer.mk b/src/sdl_mixer.mk
index 6122bbcf..4a640200 100644
--- a/src/sdl_mixer.mk
+++ b/src/sdl_mixer.mk
@@ -1,12 +1,13 @@
 # SDL_mixer
 
-PKG            := sdl_mixer
-$(PKG)_VERSION := 1.2.8
-$(PKG)_SUBDIR  := SDL_mixer-$($(PKG)_VERSION)
-$(PKG)_FILE    := SDL_mixer-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://libsdl.org/projects/SDL_mixer/
-$(PKG)_URL     := http://libsdl.org/projects/SDL_mixer/release/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc sdl libmikmod ogg smpeg
+PKG             := sdl_mixer
+$(PKG)_VERSION  := 1.2.8
+$(PKG)_CHECKSUM := 7fa56d378f9ca53434f9470aeb2997ad84a348c6
+$(PKG)_SUBDIR   := SDL_mixer-$($(PKG)_VERSION)
+$(PKG)_FILE     := SDL_mixer-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://libsdl.org/projects/SDL_mixer/
+$(PKG)_URL      := http://libsdl.org/projects/SDL_mixer/release/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc sdl libmikmod ogg smpeg
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://libsdl.org/projects/SDL_mixer/' | \
diff --git a/src/sdl_ttf.mk b/src/sdl_ttf.mk
index 51fad80a..18791e62 100644
--- a/src/sdl_ttf.mk
+++ b/src/sdl_ttf.mk
@@ -1,12 +1,13 @@
 # SDL_ttf
 
-PKG            := sdl_ttf
-$(PKG)_VERSION := 2.0.9
-$(PKG)_SUBDIR  := SDL_ttf-$($(PKG)_VERSION)
-$(PKG)_FILE    := SDL_ttf-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://libsdl.org/projects/SDL_ttf/
-$(PKG)_URL     := http://libsdl.org/projects/SDL_ttf/release/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc sdl freetype
+PKG             := sdl_ttf
+$(PKG)_VERSION  := 2.0.9
+$(PKG)_CHECKSUM := 6bc3618b08ddbbf565fe8f63f624782c15e1cef2
+$(PKG)_SUBDIR   := SDL_ttf-$($(PKG)_VERSION)
+$(PKG)_FILE     := SDL_ttf-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://libsdl.org/projects/SDL_ttf/
+$(PKG)_URL      := http://libsdl.org/projects/SDL_ttf/release/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc sdl freetype
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://libsdl.org/projects/SDL_ttf/' | \
diff --git a/src/smpeg.mk b/src/smpeg.mk
index 6b72f802..1cc08235 100644
--- a/src/smpeg.mk
+++ b/src/smpeg.mk
@@ -1,13 +1,14 @@
 # smpeg
 # http://packages.debian.org/unstable/source/smpeg
 
-PKG            := smpeg
-$(PKG)_VERSION := 0.4.5+cvs20030824
-$(PKG)_SUBDIR  := smpeg-$($(PKG)_VERSION).orig
-$(PKG)_WEBSITE := http://icculus.org/smpeg/
-$(PKG)_FILE    := smpeg_$($(PKG)_VERSION).orig.tar.gz
-$(PKG)_URL     := http://ftp.debian.org/debian/pool/main/s/smpeg/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc sdl
+PKG             := smpeg
+$(PKG)_VERSION  := 0.4.5+cvs20030824
+$(PKG)_CHECKSUM := d3460181f4b5e79b33f3bf4e9642a4fe6f98bc89
+$(PKG)_SUBDIR   := smpeg-$($(PKG)_VERSION).orig
+$(PKG)_WEBSITE  := http://icculus.org/smpeg/
+$(PKG)_FILE     := smpeg_$($(PKG)_VERSION).orig.tar.gz
+$(PKG)_URL      := http://ftp.debian.org/debian/pool/main/s/smpeg/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc sdl
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://packages.debian.org/unstable/source/smpeg' | \
diff --git a/src/tiff.mk b/src/tiff.mk
index 64f2bbd8..faaf3462 100644
--- a/src/tiff.mk
+++ b/src/tiff.mk
@@ -1,13 +1,14 @@
 # LibTIFF
 
-PKG            := tiff
-$(PKG)_VERSION := 3.8.2
-$(PKG)_SUBDIR  := tiff-$($(PKG)_VERSION)
-$(PKG)_FILE    := tiff-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.remotesensing.org/libtiff/
-$(PKG)_URL     := http://download.osgeo.org/libtiff/$($(PKG)_FILE)
-$(PKG)_URL_2   := ftp://ftp.remotesensing.org/pub/libtiff/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc pthreads zlib jpeg
+PKG             := tiff
+$(PKG)_VERSION  := 3.8.2
+$(PKG)_CHECKSUM := 549e67b6a15b42bfcd72fe17cda7c9a198a393eb
+$(PKG)_SUBDIR   := tiff-$($(PKG)_VERSION)
+$(PKG)_FILE     := tiff-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.remotesensing.org/libtiff/
+$(PKG)_URL      := http://download.osgeo.org/libtiff/$($(PKG)_FILE)
+$(PKG)_URL_2    := ftp://ftp.remotesensing.org/pub/libtiff/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc pthreads zlib jpeg
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.remotesensing.org/libtiff/' | \
diff --git a/src/tre.mk b/src/tre.mk
index 2c0130c5..645d77c1 100644
--- a/src/tre.mk
+++ b/src/tre.mk
@@ -1,12 +1,13 @@
 # TRE
 
-PKG            := tre
-$(PKG)_VERSION := 0.7.5
-$(PKG)_SUBDIR  := tre-$($(PKG)_VERSION)
-$(PKG)_FILE    := tre-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://laurikari.net/tre/
-$(PKG)_URL     := http://laurikari.net/tre/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := tre
+$(PKG)_VERSION  := 0.7.5
+$(PKG)_CHECKSUM := 16b860479341f3179ef987765aacda9e2803f7bb
+$(PKG)_SUBDIR   := tre-$($(PKG)_VERSION)
+$(PKG)_FILE     := tre-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://laurikari.net/tre/
+$(PKG)_URL      := http://laurikari.net/tre/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://laurikari.net/tre/download.html' | \
diff --git a/src/vorbis.mk b/src/vorbis.mk
index 9ce6a258..885699d8 100644
--- a/src/vorbis.mk
+++ b/src/vorbis.mk
@@ -1,12 +1,13 @@
 # Vorbis
 
-PKG            := vorbis
-$(PKG)_VERSION := 1.2.0
-$(PKG)_SUBDIR  := libvorbis-$($(PKG)_VERSION)
-$(PKG)_FILE    := libvorbis-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://www.vorbis.com/
-$(PKG)_URL     := http://downloads.xiph.org/releases/vorbis/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc pthreads ogg
+PKG             := vorbis
+$(PKG)_VERSION  := 1.2.0
+$(PKG)_CHECKSUM := 6ff5f9d9d71cc385ee180171cc21af5653b76a16
+$(PKG)_SUBDIR   := libvorbis-$($(PKG)_VERSION)
+$(PKG)_FILE     := libvorbis-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://www.vorbis.com/
+$(PKG)_URL      := http://downloads.xiph.org/releases/vorbis/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc pthreads ogg
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.xiph.org/downloads/' | \
diff --git a/src/w32api.mk b/src/w32api.mk
index bd0e8842..d6d86451 100644
--- a/src/w32api.mk
+++ b/src/w32api.mk
@@ -1,12 +1,13 @@
 # MinGW Windows API
 
-PKG            := w32api
-$(PKG)_VERSION := 3.13-mingw32
-$(PKG)_SUBDIR  := .
-$(PKG)_FILE    := w32api-$($(PKG)_VERSION)-dev.tar.gz
-$(PKG)_WEBSITE := http://mingw.sourceforge.net/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/mingw/$($(PKG)_FILE)
-$(PKG)_DEPS    :=
+PKG             := w32api
+$(PKG)_VERSION  := 3.13-mingw32
+$(PKG)_CHECKSUM := 5eb7d8ec0fe032a92bea3a2c8282a78df2f1793c
+$(PKG)_SUBDIR   := .
+$(PKG)_FILE     := w32api-$($(PKG)_VERSION)-dev.tar.gz
+$(PKG)_WEBSITE  := http://mingw.sourceforge.net/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/mingw/$($(PKG)_FILE)
+$(PKG)_DEPS     :=
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=2435&package_id=11550' | \
diff --git a/src/winpcap.mk b/src/winpcap.mk
index 00fc524f..9dde9ee5 100644
--- a/src/winpcap.mk
+++ b/src/winpcap.mk
@@ -1,12 +1,13 @@
 # WinPcap
 
-PKG            := winpcap
-$(PKG)_VERSION := 4_0_2
-$(PKG)_SUBDIR  := winpcap
-$(PKG)_FILE    := WpcapSrc_$($(PKG)_VERSION).zip
-$(PKG)_WEBSITE := http://www.winpcap.org/
-$(PKG)_URL     := http://www.winpcap.org/install/bin/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := winpcap
+$(PKG)_VERSION  := 4_0_2
+$(PKG)_CHECKSUM := faa4e0cd73352d400d123be63b9c6c02c7e132d1
+$(PKG)_SUBDIR   := winpcap
+$(PKG)_FILE     := WpcapSrc_$($(PKG)_VERSION).zip
+$(PKG)_WEBSITE  := http://www.winpcap.org/
+$(PKG)_URL      := http://www.winpcap.org/install/bin/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://www.winpcap.org/devel.htm' | \
diff --git a/src/wxwidgets.mk b/src/wxwidgets.mk
index 5dbd63d9..d8e5692d 100644
--- a/src/wxwidgets.mk
+++ b/src/wxwidgets.mk
@@ -1,12 +1,13 @@
 # wxWidgets
 
-PKG            := wxwidgets
-$(PKG)_VERSION := 2.8.10
-$(PKG)_SUBDIR  := wxMSW-$($(PKG)_VERSION)
-$(PKG)_FILE    := wxMSW-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.wxwidgets.org/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/wxwindows/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc libiconv libpng jpeg tiff sdl tre zlib expat
+PKG             := wxwidgets
+$(PKG)_VERSION  := 2.8.10
+$(PKG)_CHECKSUM := e674086391ce5c8e64ef1823654d6f88b064c8e0
+$(PKG)_SUBDIR   := wxMSW-$($(PKG)_VERSION)
+$(PKG)_FILE     := wxMSW-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.wxwidgets.org/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/wxwindows/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc libiconv libpng jpeg tiff sdl tre zlib expat
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=9863&package_id=14078' | \
diff --git a/src/xmlwrapp.mk b/src/xmlwrapp.mk
index f150701a..98bbb800 100644
--- a/src/xmlwrapp.mk
+++ b/src/xmlwrapp.mk
@@ -1,12 +1,13 @@
 # xmlwrapp
 
-PKG            := xmlwrapp
-$(PKG)_VERSION := 0.6.0
-$(PKG)_SUBDIR  := xmlwrapp-$($(PKG)_VERSION)
-$(PKG)_FILE    := xmlwrapp-$($(PKG)_VERSION).tar.gz
-$(PKG)_WEBSITE := http://sourceforge.net/projects/xmlwrapp/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/xmlwrapp/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc libxml2 libxslt
+PKG             := xmlwrapp
+$(PKG)_VERSION  := 0.6.0
+$(PKG)_CHECKSUM := 4f6f8cf4e18b8e76be1b01b575766156bbee42a0
+$(PKG)_SUBDIR   := xmlwrapp-$($(PKG)_VERSION)
+$(PKG)_FILE     := xmlwrapp-$($(PKG)_VERSION).tar.gz
+$(PKG)_WEBSITE  := http://sourceforge.net/projects/xmlwrapp/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/xmlwrapp/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc libxml2 libxslt
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=142403&package_id=156331' | \
diff --git a/src/zlib.mk b/src/zlib.mk
index e88e14b8..6c5d609f 100644
--- a/src/zlib.mk
+++ b/src/zlib.mk
@@ -1,12 +1,13 @@
 # zlib
 
-PKG            := zlib
-$(PKG)_VERSION := 1.2.3
-$(PKG)_SUBDIR  := zlib-$($(PKG)_VERSION)
-$(PKG)_FILE    := zlib-$($(PKG)_VERSION).tar.bz2
-$(PKG)_WEBSITE := http://www.zlib.net/
-$(PKG)_URL     := http://$(SOURCEFORGE_MIRROR)/libpng/$($(PKG)_FILE)
-$(PKG)_DEPS    := gcc
+PKG             := zlib
+$(PKG)_VERSION  := 1.2.3
+$(PKG)_CHECKSUM := 967e280f284d02284b0cd8872a8e2e04bfdc7283
+$(PKG)_SUBDIR   := zlib-$($(PKG)_VERSION)
+$(PKG)_FILE     := zlib-$($(PKG)_VERSION).tar.bz2
+$(PKG)_WEBSITE  := http://www.zlib.net/
+$(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/libpng/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
 
 define $(PKG)_UPDATE
     wget -q -O- 'http://sourceforge.net/project/showfiles.php?group_id=5624&package_id=14274' | \