Index: head/graphics/py-pydotplus/Makefile
===================================================================
--- head/graphics/py-pydotplus/Makefile	(revision 560498)
+++ head/graphics/py-pydotplus/Makefile	(revision 560499)
@@ -1,22 +1,22 @@
 # $FreeBSD$
 
 PORTNAME=	pydotplus
 DISTVERSION=	2.0.2
 CATEGORIES=	graphics python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Python interface to Graphviz's Dot language
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pyparsing>0:devel/py-pyparsing@${PY_FLAVOR}
 
-USES=		python
+USES=		python:3.6+
 USE_PYTHON=	distutils autoplist
 
 NO_ARCH=	yes
 
 .include <bsd.port.mk>