diff --git a/devel/csmith/Makefile b/devel/csmith/Makefile
index 926cbad8087a..d6672dde2d67 100644
--- a/devel/csmith/Makefile
+++ b/devel/csmith/Makefile
@@ -1,26 +1,34 @@
 PORTNAME=	csmith
 PORTVERSION=	2.3.0
 CATEGORIES=	devel
 MASTER_SITES=	http://embed.cs.utah.edu/csmith/
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Generates random C programs that conform to the C99 standard
 WWW=		https://embed.cs.utah.edu/csmith/
 
 LICENSE=	BSD2CLAUSE
 
+USES=		gmake libtool localbase perl5 shebangfix
+USE_CXXSTD=	c++11
+USE_LDCONFIG=	yes
+USE_PERL5=	run
+
+SHEBANG_FILES=	scripts/compiler_test.pl scripts/launchn.pl
+
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--docdir=${DOCSDIR}
-CPPFLAGS+=	-I${LOCALBASE}/include
-LIBS+=		-L${LOCALBASE}/lib
+
 INSTALL_TARGET=	install-strip
-USES=		gmake libtool perl5 shebangfix
-USE_PERL5=	run
-SHEBANG_FILES=	scripts/compiler_test.pl scripts/launchn.pl
-USE_LDCONFIG=	yes
+
+PLIST_SUB=	PKGNAME="${PKGNAME}"
 
 OPTIONS_DEFINE=	DOCS
 
-PLIST_SUB=	PKGNAME="${PKGNAME}"
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400091
+CPPFLAGS+=	-Wno-error=enum-constexpr-conversion
+.endif
 
 .include <bsd.port.mk>