$OpenBSD: patch-gcc_dbxout_c,v 1.1.1.1 2009/06/22 22:37:32 sthen Exp $
--- gcc/dbxout.c.orig	Tue Sep  2 23:20:12 2008
+++ gcc/dbxout.c	Mon Jun 22 00:53:59 2009
@@ -1136,7 +1136,7 @@ dbxout_init (const char *input_file_name)
 	  if (cwd[0] == '\0')
 	    cwd = "/";
 	  else if (!IS_DIR_SEPARATOR (cwd[strlen (cwd) - 1]))
-	    cwd = concat (cwd, "/", NULL);
+	    cwd = concat (cwd, "/", (void *)0);
 	}
 #ifdef DBX_OUTPUT_MAIN_SOURCE_DIRECTORY
       /* APPLE LOCAL ss2 */
