Index: head/devel/py-repoze.tm2/Makefile
===================================================================
--- head/devel/py-repoze.tm2/Makefile	(revision 544764)
+++ head/devel/py-repoze.tm2/Makefile	(revision 544765)
@@ -1,20 +1,20 @@
 # Created by: Wen Heping <wenheping@gmail.com>
 # $FreeBSD$
 
 PORTNAME=	repoze.tm2
 PORTVERSION=	2.1
 PORTEPOCH=	2
 CATEGORIES=	devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	python@FreeBSD.org
 COMMENT=	Zope-like transaction manager via WSGI middleware
 
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}transaction>=0:devel/py-transaction@${PY_FLAVOR}
 
 NO_ARCH=	yes
-USES=		python
+USES=		python:3.6+
 USE_PYTHON=	autoplist distutils
 
 .include <bsd.port.mk>
Index: head/devel/py-zope.generations/Makefile
===================================================================
--- head/devel/py-zope.generations/Makefile	(revision 544764)
+++ head/devel/py-zope.generations/Makefile	(revision 544765)
@@ -1,24 +1,24 @@
 # $FreeBSD$
 
 PORTNAME=	zope.generations
 PORTVERSION=	3.7.1
 PORTREVISION=	1
 CATEGORIES=	devel python zope
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 DIST_SUBDIR=	zope
 
 MAINTAINER=	zope@FreeBSD.org
 COMMENT=	Zope application schema generations
 
 LICENSE=	ZPL21
 
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}transaction>=0:devel/py-transaction@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}zope.component>=0:devel/py-zope.component@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}zope.interface>=0:devel/py-zope.interface@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}zope.processlifetime>=0:devel/py-zope.processlifetime@${PY_FLAVOR}
 
-USES=		python
+USES=		python:3.6+
 USE_PYTHON=	distutils autoplist
 
 .include <bsd.port.mk>