Index: head/math/py-rpy2/Makefile
===================================================================
--- head/math/py-rpy2/Makefile	(revision 514456)
+++ head/math/py-rpy2/Makefile	(revision 514457)
@@ -1,41 +1,41 @@
 # Created by: ijliao
 # $FreeBSD$
 
 PORTNAME=	rpy2
 DISTVERSION=	3.2.0
 PORTREVISION=	1
 CATEGORIES=	math
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Python interface to the R Programming Language
 
 LICENSE=	GPLv2+
 LICENSE_FILE=	${WRKSRC}/gpl-2.0.txt
 
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}cffi>=1.10.0:devel/py-cffi@${PY_FLAVOR}
 LIB_DEPENDS=	libR.so:math/R \
 		libicui18n.so:devel/icu \
 		libomp.so:devel/openmp \
 		libpcre.so:devel/pcre
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}cffi>=1.10.0:devel/py-cffi@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}Jinja2>0:devel/py-Jinja2@${PY_FLAVOR} \
 		${PYNUMPY} \
 		${PYTHON_PKGNAMEPREFIX}pytz>=0:devel/py-pytz@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}simplegeneric>=0:devel/py-simplegeneric@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}tzlocal>=0:devel/py-tzlocal@${PY_FLAVOR}
 
-USES=		fortran python:3.5+ readline
+USES=		compiler:c11 fortran python:3.5+ readline
 USE_PYTHON=	autoplist distutils
 
 MAKE_ENV=	RPY2_CFFI_MODE=BOTH
 
 PLIST_FILES=	${PYTHON_SITELIBDIR}/__pycache__/_rinterface_cffi_abi.cpython-${PYTHON_SUFFIX}.${PYTHON_PYOEXTENSION} \
 		${PYTHON_SITELIBDIR}/__pycache__/_rinterface_cffi_abi.cpython-${PYTHON_SUFFIX}.pyc \
 		${PYTHON_SITELIBDIR}/_rinterface_cffi_abi.py
 
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PYTHON_SITELIBDIR}/_rinterface_cffi_api.abi3.so
 
 .include <bsd.port.mk>