diff --git a/devel/llvm-devel/Makefile b/devel/llvm-devel/Makefile
index 2d0570369c74..aaf9f79a8c32 100644
--- a/devel/llvm-devel/Makefile
+++ b/devel/llvm-devel/Makefile
@@ -17,7 +17,7 @@ DOCSDIR=	${PREFIX}/share/doc/${PORTNAME}${LLVM_SUFFIX}
 DATADIR=	${PREFIX}/share/${PORTNAME}${LLVM_SUFFIX}
 UNIQUENAME=	${PORTNAME}${LLVM_SUFFIX}
 
-USES=		gmake perl5
+USES=		compiler:c++11-lang gmake perl5
 GNU_CONFIGURE=	yes
 USE_BZIP2=	yes
 GNU_CONFIGURE_PREFIX=	${LLVM_PREFIX}
diff --git a/lang/clang-devel/Makefile b/lang/clang-devel/Makefile
index defb4a16f63e..1e7e73294b45 100644
--- a/lang/clang-devel/Makefile
+++ b/lang/clang-devel/Makefile
@@ -33,7 +33,7 @@ DOCSDIR=	${PREFIX}/share/doc/${PORTNAME}${LLVM_SUFFIX}
 
 GNU_CONFIGURE=	yes
 GNU_CONFIGURE_PREFIX=	${LLVM_PREFIX}
-USES=		gmake perl5
+USES=		compiler:c++11-lang gmake perl5
 USE_BZIP2=	yes
 USE_PYTHON=	yes