Index: head/science/fsom/Makefile
===================================================================
--- head/science/fsom/Makefile
+++ head/science/fsom/Makefile
@@ -9,6 +9,7 @@
 
 LICENSE=	GPLv3
 
+USES=		compiler:c++11-lang
 USE_GITHUB=	yes
 GH_ACCOUNT=	ekg
 GH_TAGNAME=	56695e1611d824cda97f08e932d25d08419170cd