--- /usr/portage/media-libs/mesa/mesa-9.0.3.ebuild	2013-03-11 02:01:20.000000000 +0400
+++ ./mesa-9.0.3-r1.ebuild	2013-04-20 14:12:53.571174262 +0400
@@ -113,7 +113,7 @@
 
 DEPEND="${RDEPEND}
 	llvm? (
-		>=sys-devel/llvm-2.9
+		>=sys-devel/llvm-2.9[debug=]
 		r600-llvm-compiler? ( =sys-devel/llvm-3.1* )
 		video_cards_radeonsi? ( =sys-devel/llvm-3.1* )
 	)
@@ -248,6 +248,8 @@
 
 	use userland_GNU || export INDENT=cat
 
+	use debug || append-flags -DNDEBUG
+
 	econf \
 		--enable-dri \
 		--enable-glx \