Index: head/math/py-pdal/Makefile
===================================================================
--- head/math/py-pdal/Makefile	(revision 544021)
+++ head/math/py-pdal/Makefile	(revision 544022)
@@ -1,34 +1,34 @@
 # $FreeBSD$
 
 PORTNAME=	pdal
 DISTVERSION=	2.3.3
 CATEGORIES=	math python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 DISTNAME=	${PORTNAME:tu}-${DISTVERSION}
 
 MAINTAINER=	lbartoletti@FreeBSD.org
 COMMENT=	PDAL Python bindings
 
 LICENSE=	BSD3CLAUSE
 
 BUILD_DEPENDS=	${PYNUMPY} \
 		${PYTHON_PKGNAMEPREFIX}scikit-build>0:devel/py-scikit-build@${PY_FLAVOR} \
 		${LOCALBASE}/bin/cmake:devel/cmake \
 		${LOCALBASE}/bin/ninja:devel/ninja
 LIB_DEPENDS=	libpdal_base.so:math/pdal
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}packaging>=0:devel/py-packaging@${PY_FLAVOR} \
 		${PYNUMPY}
 
-USES=		python
+USES=		python:3.6+
 USE_PYTHON=	autoplist cython distutils
 
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/lib/libpdal_plugin_filter_python.so
 	${STRIP_CMD} ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/${PORTNAME}/libpdalpython.so
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/lib/libpdal_plugin_reader_numpy.so
 
 do-test:
 	@cd ${WRKSRC} && ${PYTHON_CMD} ${PYDISTUTILS_SETUP} test
 
 .include <bsd.port.mk>