Index: head/devel/elfio/Makefile
===================================================================
--- head/devel/elfio/Makefile
+++ head/devel/elfio/Makefile
@@ -12,6 +12,8 @@
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/COPYING
 
+USES=		compiler:c++11-lang
+
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--bindir=${EXAMPLESDIR}