http://openwrt.org/forum/viewtopic.php?pid=8332#p8332
---- ipkg-utils-1.7/ipkg-build.orig 2005-06-14 23:48:36.000000000 +0200
-+++ ipkg-utils-1.7/ipkg-build 2005-06-14 23:50:03.000000000 +0200
-@@ -243,7 +243,7 @@
+--- a/ipkg-build
++++ b/ipkg-build
+@@ -184,7 +184,7 @@ while getopts "cg:ho:v" opt; do
+ g ) group=$OPTARG
+ ogargs="$ogargs --group=$group"
+ ;;
+- c ) outer=tar
++ c ) outer=$TAR
+ ;;
+ C ) noclean=1
+ ;;
+@@ -243,8 +243,8 @@ tmp_dir=$dest_dir/IPKG_BUILD.$$
mkdir $tmp_dir
echo $CONTROL > $tmp_dir/tarX
-( cd $pkg_dir && tar $ogargs -czf $tmp_dir/data.tar.gz . -X $tmp_dir/tarX )
-+( cd $pkg_dir && tar $ogargs -X $tmp_dir/tarX -czf $tmp_dir/data.tar.gz . )
- ( cd $pkg_dir/$CONTROL && tar $ogargs -czf $tmp_dir/control.tar.gz . )
+-( cd $pkg_dir/$CONTROL && tar $ogargs -czf $tmp_dir/control.tar.gz . )
++( cd $pkg_dir && $TAR $ogargs -X $tmp_dir/tarX -czf $tmp_dir/data.tar.gz . )
++( cd $pkg_dir/$CONTROL && $TAR $ogargs -czf $tmp_dir/control.tar.gz . )
rm $tmp_dir/tarX
+ echo "2.0" > $tmp_dir/debian-binary
+@@ -254,7 +254,7 @@ rm -f $pkg_file
+ if [ "$outer" = "ar" ] ; then
+ ( cd $tmp_dir && ar -crf $pkg_file ./debian-binary ./data.tar.gz ./control.tar.gz )
+ else
+- ( cd $tmp_dir && tar -zcf $pkg_file ./debian-binary ./data.tar.gz ./control.tar.gz )
++ ( cd $tmp_dir && $TAR -zcf $pkg_file ./debian-binary ./data.tar.gz ./control.tar.gz )
+ fi
+
+ rm $tmp_dir/debian-binary $tmp_dir/data.tar.gz $tmp_dir/control.tar.gz