Index: head/science/py-gpaw/Makefile
===================================================================
--- head/science/py-gpaw/Makefile	(revision 507522)
+++ head/science/py-gpaw/Makefile	(revision 507523)
@@ -1,34 +1,34 @@
 # $FreeBSD$
 
 PORTNAME=	gpaw
 DISTVERSION=	1.5.2
 PORTREVISION=	1
 CATEGORIES=	science python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	DFT and beyond within the projector-augmented wave method in chemistry
 
 LICENSE=	GPLv3+
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 BUILD_DEPENDS=	${PYNUMPY}
 LIB_DEPENDS=	libmpich.so:net/mpich \
 		libopenblas.so:math/openblas \
 		libxc.so:science/libxc
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}ase>0:science/py-ase@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}matplotlib>0:math/py-matplotlib@${PY_FLAVOR} \
 		${PYNUMPY}
 
-USES=		gettext-runtime localbase python shebangfix
+USES=		gettext-runtime localbase python:3.5+ shebangfix
 USE_PYTHON=	distutils concurrent autoplist
 SHEBANG_FILES=	tools/*
 
 post-patch:
 	@${REINPLACE_CMD} "s|'/usr/local/|'${LOCALBASE}/|" ${WRKSRC}/gpaw/__init__.py
 
 post-install:
 	@${STRIP_CMD} ${STAGEDIR}${PREFIX}/bin/gpaw-python ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/_gpaw.so
 
 .include <bsd.port.mk>