diff -up chromium-120.0.6099.56/ui/gfx/linux/drm_util_linux.cc.el7-old-libdrm chromium-120.0.6099.56/ui/gfx/linux/drm_util_linux.cc
--- chromium-120.0.6099.56/ui/gfx/linux/drm_util_linux.cc.el7-old-libdrm	2023-11-29 22:40:44.000000000 +0100
+++ chromium-120.0.6099.56/ui/gfx/linux/drm_util_linux.cc	2023-12-03 10:33:35.468492298 +0100
@@ -6,6 +6,14 @@
 
 #include <drm_fourcc.h>
 
+// the libdrm in EL-7 is too old to have this define
+#ifndef DRM_FORMAT_P010
+#define DRM_FORMAT_P010 fourcc_code('P', '0', '1', '0')
+#endif
+#ifndef DRM_FORMAT_ABGR16161616F
+#define DRM_FORMAT_ABGR16161616F fourcc_code('A', 'B', '4', 'H')
+#endif
+
 #include "base/notreached.h"
 
 namespace ui {