diff --git a/tools/patch-tool-mingw b/tools/patch-tool-mingw
new file mode 100755
index 00000000..304e1b79
--- /dev/null
+++ b/tools/patch-tool-mingw
@@ -0,0 +1,80 @@
+#!/bin/bash
+
+# Tool for converting between mingw-cross-env patch files and git repos
+# Imports and exports patch files in "git format-patch" format.
+
+cmd=$1
+pkg=$2
+
+# mingw-cross-env directory
+mcedir=~/mingw-cross-env
+
+# directory for unpacked tarballs/git repos
+gitsdir=~/gits
+
+
+# John Doe <John Doe@acme.org>
+author=`git var GIT_AUTHOR_IDENT | sed 's/^\(.* [<].*[>]\).*$/\1/'`
+
+pkg_version=`grep '^$(PKG)_VERSION' $mcedir/src/$pkg.mk  | \
+  sed 's/.*:= \(.*\)/\1/'`
+
+pkg_short_version=`echo $pkg_version | sed s/'\(.*\)\.[^.]*$'/'\1'/`
+
+pkg_subdir=`grep '^$(PKG)_SUBDIR' $mcedir/src/$pkg.mk  | \
+  sed 's/.*:= \(.*\)/\1/' | \
+  sed s/'$($(PKG)_VERSION)'/$pkg_version/ | \
+  sed s/'$(call SHORT_PKG_VERSION,$(PKG))'/$pkg_short_version/ | \
+  sed s/'$(PKG)'/$pkg/;`
+
+pkg_file=`grep '^$(PKG)_FILE' $mcedir/src/$pkg.mk  | \
+  sed 's/.*:= \(.*\)/\1/' | \
+  sed s/'$($(PKG)_VERSION)'/$pkg_version/ | \
+  sed s/'$(call SHORT_PKG_VERSION,$(PKG))'/$pkg_short_version/ | \
+  sed s/'$($(PKG)_SUBDIR)'/$pkg_subdir/ | \
+  sed s/'$(PKG)'/$pkg/;`
+
+#echo $pkg
+#echo $pkg_version
+#echo $pkg_subdir
+#echo $pkg_file
+
+# init
+function init_git {
+  cd $gitsdir
+  echo $pkg_file | grep "\.tar\.gz" >> /dev/null  && tar xf $mcedir/pkg/$pkg_file
+  echo $pkg_file | grep "\.tar\.bz2" >> /dev/null && tar xf $mcedir/pkg/$pkg_file
+  echo $pkg_file | grep "\.zip" >> /dev/null      && unzip $mcedir/pkg/$pkg_file >> /dev/null
+  cd $gitsdir/$pkg_subdir && \
+  (git init; git add -A; git commit -m "init") > /dev/null
+  git tag dist
+}
+
+function export_patch {
+  cd $gitsdir/$pkg_subdir && \
+  (
+    echo 'This file is part of mingw-cross-env.'
+    echo 'See doc/index.html for further information.'
+    echo ''
+    echo 'Contains ad hoc patches for cross building.'
+    echo ''
+    git format-patch -p --stdout dist..HEAD | \
+    sed 's/^From: .*/From: mingw-cross-env/g;'
+  ) > $mcedir/src/$pkg-1-fixes.patch
+}
+
+function import_patch {
+  cd $gitsdir/$pkg_subdir && \
+  cat $mcedir/src/$pkg-1-fixes.patch | \
+  sed '/^From/,$  !d' | \
+  sed s/'^From: .*'/"From: $author"/'g;' | \
+  git am --keep-cr
+}
+
+if [ "$cmd" == "init" ]; then
+  init_git $pkg
+elif [ "$cmd" == "import" ]; then
+  import_patch $pkg
+elif [ "$cmd" == "export" ]; then
+  export_patch $pkg
+fi