Index: head/devel/b2/Makefile
===================================================================
--- head/devel/b2/Makefile	(revision 455501)
+++ head/devel/b2/Makefile	(revision 455502)
@@ -1,32 +1,37 @@
 # Created by: Bartek Rutkowski <robak@FreeBSD.org>
 # $FreeBSD$
 
 PORTNAME=	b2
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.1.0
 CATEGORIES=	devel
 
 MAINTAINER=	robak@FreeBSD.org
 COMMENT=	Command Line Interface for Backblaze's B2 storage service
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}arrow>=0.8.0:devel/py-arrow@${FLAVOR} \
-		${PYTHON_PKGNAMEPREFIX}futures>=3.0.5:devel/py-futures@${FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}logfury>=0.1.2:devel/py-logfury@${FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}requests>=2.9.1:www/py-requests@${FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}six>=1.10:devel/py-six@${FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}sqlite3>0:databases/py-sqlite3@${FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}tqdm>=4.5.0:misc/py-tqdm@${FLAVOR}
 
 USES=		python:2.7+
 USE_PYTHON=	distutils autoplist concurrent optsuffix
 
 NO_ARCH=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	Backblaze
 GH_PROJECT=	B2_Command_Line_Tool
 
-.include <bsd.port.mk>
+.include <bsd.port.pre.mk>
+
+.if ${PYTHON_REL} < 3000
+RUN_DEPENDS+=	${PYTHON_PKGNAMEPREFIX}futures>=3.0.5:devel/py-futures@${FLAVOR}
+.endif
+
+.include <bsd.port.post.mk>