https://bugs.gentoo.org/907479
https://bugs.gentoo.org/907481
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/55ee0635d3f63c408067dd904f8e8b718983ba0e
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/479f0175b51ea74b07084c8a508b7a7224445a02
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4428

From 864a329f7946460f9bb9dac171d0d80b2ff09a07 Mon Sep 17 00:00:00 2001
From: Nirbheek Chauhan <nirbheek@centricular.com>
Date: Fri, 14 Apr 2023 13:18:52 +0530
Subject: [PATCH 1/2] meson: Fix libdrm and vaapi configure checks

We do not need fallback: for libdrm checks because the wrap file
already has a [provide] section.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4428>
--- a/gst-libs/gst/va/meson.build
+++ b/gst-libs/gst/va/meson.build
@@ -31,17 +31,26 @@ if host_system != 'linux'
   subdir_done()
 endif
 
+va_opt = get_option('va')
+msdk_opt = get_option('msdk')
+qsv_opt = get_option('qsv')
+if va_opt.disabled() and msdk_opt.disabled() and qsv_opt.disabled()
+  subdir_done()
+endif
+
+va_required = va_opt.enabled() or msdk_opt.enabled() or qsv_opt.enabled()
+
 libva_req = ['>= 1.6']
-libva_dep = dependency('libva', version: libva_req, required: false,
+libva_dep = dependency('libva', version: libva_req, required: va_required,
     fallback: ['libva', 'libva_dep'])
-libva_drm_dep = dependency('libva-drm', version: libva_req, required: false,
+libva_drm_dep = dependency('libva-drm', version: libva_req, required: va_required,
     fallback: ['libva', 'libva_drm_dep'])
 
 if not (libva_dep.found() and libva_drm_dep.found())
   subdir_done()
 endif
 
-libdrm_dep = dependency('libdrm', required: false, fallback: ['libdrm', 'ext_libdrm'])
+libdrm_dep = dependency('libdrm', version: '>=2.4', required: false)
 cdata.set10('HAVE_LIBDRM', libdrm_dep.found())
 
 va_enums = gnome.mkenums_simple('va-enumtypes',
--- a/sys/kms/meson.build
+++ b/sys/kms/meson.build
@@ -11,11 +11,9 @@ if host_system != 'linux'
 endif
 
 libdrm_dep = dependency('libdrm', version : '>= 2.4.98',
-                        required : get_option('kms'),
-                        fallback: ['libdrm', 'ext_libdrm'])
+                        required : get_option('kms'))
 libdrm_hdr_dep = dependency('libdrm', version : '>= 2.4.104',
-                            required : false,
-                            fallback: ['libdrm', 'ext_libdrm'])
+                            required : false)
 mathlib = cc.find_library('m', required : false)
 
 if libdrm_hdr_dep.found() and mathlib.found()
-- 
2.40.1