Complete adding of GNU sort

Mention GNU Coreutils in the requirements section and check that
$(SORT) is available.

Makefile

@@ -23,7 +23,7 @@ WGET       := wget --no-check-certificate \
 REQUIREMENTS := autoconf automake bash bison bzip2 cmake flex \
                 gcc intltoolize $(LIBTOOL) $(LIBTOOLIZE) \
                 $(MAKE) openssl $(PATCH) $(PERL) pkg-config \
-                scons $(SED) unzip wget xz yasm
+                scons $(SED) $(SORT) unzip wget xz yasm
 
 PREFIX     := $(PWD)/usr
 LOG_DIR    := $(PWD)/log

index.html

@@ -614,6 +614,10 @@ USE_OSGPLUGIN(<plugin2>)
         <td><a href="http://git-scm.com/">Git</a></td>
         <td>≥ 1.7</td>
     </tr>
+    <tr>
+        <td><a href="http://www.gnu.org/software/coreutils/">GNU Coreutils</a></td>
+        <td></td>
+    </tr>
     <tr>
         <td><a href="http://www.gnu.org/s/gettext/">GNU Gettext</a></td>
         <td></td>