Index: head/math/py-qdldl/Makefile
===================================================================
--- head/math/py-qdldl/Makefile	(revision 560683)
+++ head/math/py-qdldl/Makefile	(revision 560684)
@@ -1,23 +1,23 @@
 # $FreeBSD$
 
 PORTNAME=	qdldl
 DISTVERSION=	0.1.5.post0
 CATEGORIES=	math python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	QDLDL free LDL factorization routine for linear systems: Ax = b
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pybind11>0:devel/py-pybind11@${PY_FLAVOR} \
 		cmake:devel/cmake
 RUN_DEPENDS=	${PYNUMPY} \
 		${PYTHON_PKGNAMEPREFIX}scipy>=0.13.2:science/py-scipy@${PY_FLAVOR}
 
-USES=		python
+USES=		python:3.6+
 USE_PYTHON=	distutils autoplist
 
 .include <bsd.port.mk>