Index: head/graphics/py-box2d-py/Makefile
===================================================================
--- head/graphics/py-box2d-py/Makefile	(revision 559908)
+++ head/graphics/py-box2d-py/Makefile	(revision 559909)
@@ -1,23 +1,23 @@
 # $FreeBSD$
 
 PORTNAME=	box2d-py
 DISTVERSION=	2.3.8
 CATEGORIES=	graphics
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	neel@neelc.org
 COMMENT=	2D physics library Box2D 2.3 for usage in Python
 
 LICENSE=	ZLIB
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	swig:devel/swig
 LIB_DEPENDS=	libBox2D.so:misc/box2d
 
-USES=		python:3.6+
+USES=		compiler:c11 python:3.6+
 USE_PYTHON=	autoplist distutils
 
 SUB_FILES=	pkg-message
 
 .include <bsd.port.mk>