--- ./gpac-0.4.5-r4.ebuild~	2011-03-29 13:35:14.000000000 +0400
+++ ./gpac-0.4.5-r4.ebuild	2011-03-29 13:35:09.000000000 +0400
@@ -95,6 +95,9 @@
 	# multilib libdir fix
 	sed -i -e 's:$(prefix)/lib:$(prefix)/'$(get_libdir)':' Makefile src/Makefile
 	sed -i -e 's:/lib/gpac:/'$(get_libdir)'/gpac:' configure
+
+	# --warn-common is linker option, not gcc's one
+	sed -i 's/-Wl --warn-common/-Wl,--warn-common/g' configure
 }
 
 src_compile() {