Index: head/math/matio/Makefile
===================================================================
--- head/math/matio/Makefile	(revision 499466)
+++ head/math/matio/Makefile	(revision 499467)
@@ -1,30 +1,30 @@
 # Created by: rfarmer@predatorlabs.net
 # $FreeBSD$
 
 PORTNAME=	matio
 PORTVERSION=	1.5.15
 CATEGORIES=	math
 MASTER_SITES=	SF
 
 MAINTAINER=	makc@FreeBSD.org
 COMMENT=	Library for reading and writing Matlab MAT files
 
 LICENSE=	BSD2CLAUSE
 
 GNU_CONFIGURE=	yes
-USES=		7z libtool pathfix
+USES=		7z compiler:c11 libtool pathfix
 USE_LDCONFIG=	yes
 INSTALL_TARGET=	install-strip
 
 OPTIONS_DEFINE=	HDF5
 OPTIONS_DEFAULT=	HDF5
 
 HDF5_DESC=	Support for MAT file version 7.3
 HDF5_LIB_DEPENDS=	libhdf5.so:science/hdf5
 HDF5_CONFIGURE_ON=	--enable-mat73=yes \
 			--with-hdf5=${LOCALBASE}
 
 post-extract:
 	@${CHMOD} +x ${WRKSRC}/configure
 
 .include <bsd.port.mk>