--- /usr/portage/games-strategy/warzone2100/warzone2100-2.3.9.ebuild
+++ /usr/local/portage/games-strategy/warzone2100/warzone2100-2.3.9.ebuild
@@ -42,6 +42,10 @@
 	media-fonts/dejavu"
 
 src_prepare() {
+	sed \
+		-e 's/#top_builddir/top_builddir/' \
+		-i po/Makevars || die
+
 	eautoreconf
 }