diff --git a/graphics/drm-66-kmod/Makefile b/graphics/drm-66-kmod/Makefile
index db1e64b0f5ea..17fcea735cd2 100644
--- a/graphics/drm-66-kmod/Makefile
+++ b/graphics/drm-66-kmod/Makefile
@@ -1,61 +1,67 @@
 PORTNAME=	drm-66-kmod
 PORTVERSION=	${DRM_KMOD_DISTVERSION}
 PORTREVISION=	8
 CATEGORIES=	graphics kld
 
 .include "Makefile.version"
 
 MAINTAINER=	x11@FreeBSD.org
 COMMENT=	Direct Rendering Manager GPU drivers
 WWW=		https://github.com/freebsd/drm-kmod/
 
 LICENSE=	BSD2CLAUSE MIT GPLv2
 LICENSE_COMB=	multi
 
 ONLY_FOR_ARCHS=	amd64
 ONLY_FOR_ARCHS_REASON=	the new KMS components are only supported on amd64
 
 CONFLICTS_INSTALL=	drm-510-kmod \
 			drm-515-kmod \
 			drm-61-kmod
 
 USES=		kmod uidfix compiler:c++11-lang
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	freebsd
 GH_PROJECT=	drm-kmod
 GH_TAGNAME=	${DRM_KMOD_GH_TAGNAME}
 
 .include <bsd.port.options.mk>
 
 SUB_FILES=	pkg-message
 SUB_LIST=	PORTNAME=${PORTNAME} OPSYS=${OPSYS} OSREL=${OSREL}
 
 .if ${OPSYS} == FreeBSD && !( ${OSVERSION} >= 1500031 )
 IGNORE=		not supported on older than 1500031, no kernel support
 .endif
 .if ${OPSYS} != FreeBSD
 IGNORE=		not supported on anything but FreeBSD (missing linuxkpi functionality)
 .endif
 
 .if ${ARCH} == "amd64"
 PLIST_SUB+=	AMDGPU=""
 PLIST_SUB+=	I915=""
 .elif ${ARCH} == "i386"
 PLIST_SUB+=	AMDGPU="@comment "
 PLIST_SUB+=	I915=""
 .elif ${ARCH} == "aarch64" || ${ARCH:Mpowerpc*}
 PLIST_SUB+=	AMDGPU=""
 PLIST_SUB+=	I915="@comment "
 .else
 PLIST_SUB+=	AMDGPU="@comment "
 PLIST_SUB+=	I915="@comment "
 .endif
 
 MAKE_ENV+=	MAKEOBJDIRPREFIX=${WRKSRC}/obj
 
+.include <bsd.port.pre.mk>
+
+.if ${COMPILER_TYPE} == clang && ${COMPILER_VERSION} >= 211
+CFLAGS+=	-Wno-default-const-init-var-unsafe
+.endif
+
 pre-build:
 		${MKDIR} ${WRKSRC}/obj
 		(cd ${WRKSRC} ; ${SETENV} ${MAKE_ENV} ${MAKE_CMD} obj)
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>