Index: Makefile
===================================================================
--- Makefile	(revision 516831)
+++ Makefile	(working copy)
@@ -3,6 +3,7 @@
 
 PORTNAME=	mypy
 PORTVERSION=	0.740
+PORTREVISION=	1
 CATEGORIES=	devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -19,7 +20,7 @@
 		${PYTHON_PKGNAMEPREFIX}typing-extensions>=3.7.4:devel/py-typing-extensions@${PY_FLAVOR}
 
 USES=		python:3.5+ shebangfix
-USE_PYTHON=	autoplist distutils
+USE_PYTHON=	autoplist distutils concurrent
 
 NO_ARCH=	yes