Index: head/devel/py-immutables/Makefile
===================================================================
--- head/devel/py-immutables/Makefile	(revision 523772)
+++ head/devel/py-immutables/Makefile	(revision 523773)
@@ -1,22 +1,22 @@
 # Created by: Po-Chuan Hsieh <sunpoet@FreeBSD.org>
 # $FreeBSD$
 
 PORTNAME=	immutables
 PORTVERSION=	0.11
 CATEGORIES=	devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Immutable collections
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-USES=		python
-USE_PYTHON=	autoplist concurrent distutils
+USES=		python:3.5+
+USE_PYTHON=	autoplist distutils
 
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PYTHON_SITELIBDIR}/immutables/_map.so
 
 .include <bsd.port.mk>