This patch from aorlinsk fixes an issue with order in options passed to tar

  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 @@
 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 . )
 rm $tmp_dir/tarX