Index: head/security/py-cryptography/Makefile
===================================================================
--- head/security/py-cryptography/Makefile	(revision 458624)
+++ head/security/py-cryptography/Makefile	(revision 458625)
@@ -1,41 +1,49 @@
 # Created by: Kubilay Kocak <koobs@FreeBSD.org>
 # $FreeBSD$
 
 PORTNAME=	cryptography
 PORTVERSION=	2.0.3
 PORTREVISION=	1
 CATEGORIES=	security python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	koobs@FreeBSD.org
 COMMENT=	Cryptographic recipes and primitives for Python developers
 
 LICENSE=			APACHE20 BSD3CLAUSE
 LICENSE_COMB=			dual
 LICENSE_FILE_APACHE20=		${WRKSRC}/LICENSE.APACHE
 LICENSE_FILE_BSD3CLAUSE=	${WRKSRC}/LICENSE.BSD
 
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}cffi>=1.7:devel/py-cffi@${FLAVOR}
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}six>=1.4.1:devel/py-six@${FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}asn1crypto>=0.21.0:devel/py-asn1crypto@${FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}cffi>=1.7:devel/py-cffi@${FLAVOR} \
 		${PY_ENUM34} ${PY_IPADDRESS} \
 		${PYTHON_PKGNAMEPREFIX}idna>=2.1:dns/py-idna@${FLAVOR}
 TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pytest>=2.9.0:devel/py-pytest@${FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}iso8601>0:devel/py-iso8601@${FLAVOR}
 
 # Python 2.7, 3.4-3.6
-USES=		python ssl
+USES=		compiler:env python ssl
 USE_PYTHON=	autoplist concurrent distutils
 
 CFLAGS+=	-I${OPENSSLINC}
 LDFLAGS+=	-L${OPENSSLLIB}
 
+.include <bsd.port.pre.mk>
+
+.if ${CHOSEN_COMPILER_TYPE} == gcc && ${COMPILER_VERSION} <= 42
+post-patch:
+	@${REINPLACE_CMD} -e 's|"-Wno-error=sign-conversion"||' \
+		${WRKSRC}/src/_cffi_src/build_openssl.py
+.endif
+
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PYTHON_SITELIBDIR}/cryptography/hazmat/bindings/*.so
 
 do-test:
 	@cd ${WRKSRC} && ${PYTHON_CMD} ${PYDISTUTILS_SETUP} test
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>