Index: graphics/drm-devel-kmod/Makefile
===================================================================
--- graphics/drm-devel-kmod/Makefile	(revision 526960)
+++ graphics/drm-devel-kmod/Makefile	(working copy)
@@ -21,7 +21,7 @@ CONFLICTS_INSTALL=	drm-current-kmod \
 			drm-fbsd12.0-kmod \
 			drm-legacy-kmod
 
-OPTIONS_DEFINE=	DEBUG
+OPTIONS_DEFINE=	DEBUG STABLE
 
 USES=		kmod uidfix compiler:c++11-lang
 
@@ -30,6 +30,13 @@ GH_ACCOUNT=	FreeBSDDesktop
 GH_PROJECT=	kms-drm
 GH_TAGNAME=	54164ff
 
+STABLE_DESC=		Apply bugfixes from stable Linux branches (5.0.y and 4.19.y)
+STABLE_PATCH_SITES=	https://github.com/${GH_ACCOUNT}/${GH_PROJECT}/pull/
+STABLE_PATCHFILES=	221.diff:-p1
+.if make(makesum)
+.MAKEFLAGS:		WITH+=STABLE
+.endif
+
 .include <bsd.port.options.mk>
 
 .if ${OPSYS} == FreeBSD && ${OSVERSION} < 1300055
Index: graphics/drm-devel-kmod/distinfo
===================================================================
--- graphics/drm-devel-kmod/distinfo	(revision 526960)
+++ graphics/drm-devel-kmod/distinfo	(working copy)
@@ -1,3 +1,5 @@
 TIMESTAMP = 1582314495
 SHA256 (FreeBSDDesktop-kms-drm-5.0.g20200221-54164ff_GH0.tar.gz) = a549449b82d6ae9c9c933ce93d25c106eb86cfea1ecd7f1344dcb698219e44b3
 SIZE (FreeBSDDesktop-kms-drm-5.0.g20200221-54164ff_GH0.tar.gz) = 14634831
+SHA256 (221.diff) = 4ae3c84713263f5c1e62c7931b8a9f7a6c16680dfcb558ba1c57f398474f72a5
+SIZE (221.diff) = 175361