Index: head/math/py-benford_py/Makefile
===================================================================
--- head/math/py-benford_py/Makefile	(revision 554679)
+++ head/math/py-benford_py/Makefile	(revision 554680)
@@ -1,21 +1,21 @@
 # $FreeBSD$
 
 PORTNAME=	benford_py
 DISTVERSION=	0.2.7
 CATEGORIES=	math python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Library for testing data sets with Bendford's Law
 
 LICENSE=	GPLv3
 
 RUN_DEPENDS=	${PYNUMPY} \
 		${PYTHON_PKGNAMEPREFIX}matplotlib>0:math/py-matplotlib@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}pandas>0:math/py-pandas@${PY_FLAVOR}
 
-USES=		python
+USES=		python:3.6+
 USE_PYTHON=	distutils autoplist
 
 .include <bsd.port.mk>