Index: Makefile
===================================================================
--- Makefile	(revision 485843)
+++ Makefile	(working copy)
@@ -28,7 +28,7 @@
 MAKE_JOBS_UNSAFE=	yes
 TEST_TARGET=	check
 USE_LDCONFIG=	yes
-USES=		libtool localbase tar:bzip2
+USES=		compiler:c11 libtool localbase tar:bzip2
 
 PORTEXAMPLES=	*