Index: head/biology/tabixpp/Makefile
===================================================================
--- head/biology/tabixpp/Makefile	(revision 556112)
+++ head/biology/tabixpp/Makefile	(revision 556113)
@@ -1,37 +1,37 @@
 # $FreeBSD$
 
 PORTNAME=	tabixpp
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.0.0-10
 PORTREVISION=	1
 DISTVERSIONSUFFIX=	-g6bbe690
 CATEGORIES=	biology
 
 MAINTAINER=	jwb@FreeBSD.org
 COMMENT=	C++ wrapper to tabix indexer
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 LIB_DEPENDS=	libhts.so:biology/htslib
 
-USES=		localbase:ldflags
+USES=		compiler:c11 localbase:ldflags
 USE_LDCONFIG=	yes
 USE_GITHUB=	yes
 GH_ACCOUNT=	ekg
 
 # Disable bundled htslib
 MAKE_ENV=	HTS_HEADERS='' HTS_LIB=''
 MAKEFILE=	${FILESDIR}/Makefile
 INSTALL_TARGET=	install-strip
 PLIST_FILES=	bin/tabix++ \
 		include/tabix.hpp \
 		lib/libtabix.a \
 		lib/libtabix.so \
 		lib/libtabix.so.1
 
 post-install:
 	${RLN} ${STAGEDIR}${PREFIX}/lib/libtabix.so.1 \
 		${STAGEDIR}${PREFIX}/lib/libtabix.so
 
 .include <bsd.port.mk>