diff --git a/cmrtlib/linux/hardware/drm_device.h b/cmrtlib/linux/hardware/drm_device.h
index 9deb8feb66..9ecc9c845d 100644
--- a/cmrtlib/linux/hardware/drm_device.h
+++ b/cmrtlib/linux/hardware/drm_device.h
@@ -61,6 +61,26 @@
 #define MAP_FAILED ((void *)-1)
 #endif
 
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
+#define DRM_MAJOR 145
+#endif
+
+#ifdef __NetBSD__
+#define DRM_MAJOR 34
+#endif
+
+#ifdef __OpenBSD__
+#ifdef __i386__
+#define DRM_MAJOR 88
+#else
+#define DRM_MAJOR 87
+#endif
+#endif /* __OpenBSD__ */
+
+#ifndef DRM_MAJOR
+#define DRM_MAJOR 226 /* Linux */
+#endif
+
 #define DRM_DEV_UID  0
 #define DRM_DEV_GID  0
 /* Default /dev/dri directory permissions 0755 */