Add more dummy id macros
diff --git a/include/bsd/cdefs.h b/include/bsd/cdefs.h
index 0ed7be9..8736e8c 100644
--- a/include/bsd/cdefs.h
+++ b/include/bsd/cdefs.h
@@ -69,4 +69,20 @@
# define __FBSDID(x)
#endif
+#ifndef __RCSID
+# define __RCSID(x)
+#endif
+
+#ifndef __RCSID_SOURCE
+# define __RCSID_SOURCE
+#endif
+
+#ifndef __SCCSID
+# define __SCCSID
+#endif
+
+#ifndef __COPYRIGHT
+# define __COPYRIGHT
+#endif
+
#endif