Index: head/devel/py-ttictoc/Makefile
===================================================================
--- head/devel/py-ttictoc/Makefile	(revision 540858)
+++ head/devel/py-ttictoc/Makefile	(revision 540859)
@@ -1,22 +1,22 @@
 # $FreeBSD$
 
 PORTNAME=	ttictoc
 PORTVERSION=	0.5.6
 PORTREVISION=	1
 CATEGORIES=	devel
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	gmm@tutanota.com
 COMMENT=	Time execution of blocks of code
 
 LICENSE=	MIT
 
 RUN_DEPENDS+=	${PYTHON_PKGNAMEPREFIX}black>0:devel/py-black@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}pytest>0:devel/py-pytest@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}flake8>0:devel/py-flake8@${PY_FLAVOR}
 
-USES=	localbase python
+USES=	localbase python:3.6+
 USE_PYTHON=	autoplist distutils
 
 .include <bsd.port.mk>