Index: head/biology/py-biopython/Makefile
===================================================================
--- head/biology/py-biopython/Makefile	(revision 538670)
+++ head/biology/py-biopython/Makefile	(revision 538671)
@@ -1,34 +1,34 @@
 # Created by: Johann Visagie <johann@egenetics.com>
 # $FreeBSD$
 
 PORTNAME=	biopython
 DISTVERSION=	1.77
 CATEGORIES=	biology python
 MASTER_SITES=	http://www.biopython.org/DIST/
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	mauricio@arareko.net
 COMMENT=	Collection of Python modules for bioinformatics
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE.rst
 
 BUILD_DEPENDS=	${PYNUMPY}
 RUN_DEPENDS=	${PYNUMPY}
 
-USES=		python
+USES=		python:3.6+
 USE_PYTHON=	distutils autoplist
 
 OPTIONS_DEFINE=		REPORTLAB
 OPTIONS_DEFAULT=	REPORTLAB
 
 REPORTLAB_DESC=		PDF support in Bio.Graphics module
 REPORTLAB_RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}reportlab>0:print/py-reportlab@${PY_FLAVOR}
 
 post-install:
 	@${STRIP_CMD} \
 		${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/Bio/*.so \
 		${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/Bio/*/*.so \
 		${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/Bio/*/*/*.so \
 
 .include <bsd.port.mk>