Index: head/math/elpa/Makefile
===================================================================
--- head/math/elpa/Makefile	(revision 505341)
+++ head/math/elpa/Makefile	(revision 505342)
@@ -1,49 +1,49 @@
 # $FreeBSD$
 
 PORTNAME=	elpa
 DISTVERSION=	2018.11.001
 PORTREVISION=	1
 CATEGORIES=	math
 MASTER_SITES=	http://elpa.mpcdf.mpg.de/html/Releases/${DISTVERSION}/
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Eigenvalue soLver for Petaflop Applications
 
 LICENSE=	GPLv3 LGPL3
 LICENSE_COMB=	dual
 LICENSE_FILE_GPLv3=	${WRKSRC}/COPYING/gpl.txt
 LICENSE_FILE_LGPL3=	${WRKSRC}/COPYING/lgpl.txt
 
 LIB_DEPENDS=	libopenblas.so:math/openblas
 
-USES=		fortran gmake libtool localbase perl5 shebangfix
+USES=		compiler:c11 fortran gmake libtool localbase perl5 shebangfix
 SHEBANG_GLOB=	*.pl
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--disable-avx --disable-avx2 --disable-static
 USE_LDCONFIG=	yes
 
 BINARY_ALIAS=	make=gmake gcc=gcc${GCC_DEFAULT} g++=g++${GCC_DEFAULT} # build fails with clang: recursively calls cc
 FCFLAGS+=	-I${LOCALBASE}/include
 
 OPTIONS_DEFINE=			OPENMP MPI DOCS
 OPTIONS_DEFINE_amd64=		SSE
 OPTIONS_DEFAULT_amd64=		SSE
 
 SSE_CFLAGS=			-msse3
 OPENMP_CONFIGURE_ENABLE=	openmp
 MPI_CONFIGURE_WITH=		mpi
 MPI_LIB_DEPENDS=		libmpich.so:net/mpich \
 				libscalapack.so:math/scalapack
 
 PORTDOCS=	*
 
 .include <bsd.port.options.mk>
 
 .if ${PORT_OPTIONS:NSSE}
 CONFIGURE_ARGS+=	--disable-sse --disable-sse-assembly
 .endif
 
 post-install-DOCS-on:
 	@cd ${STAGEDIR}${DOCSDIR} && ${RM} *gpl* COPYING LICENSE
 
 .include <bsd.port.mk>