--- m4-1.4/src/m4.h.orig	Tue Feb  6 12:26:50 2001
+++ m4-1.4/src/m4.h	Tue Feb  6 12:54:05 2001
@@ -128,7 +128,11 @@
 #define obstack_chunk_free	xfree
 
 /* Other library routines.  */
-void error _((int, int, const char *, ...));
+void error _((int, int, const char *, ...))
+#ifdef __GNUC__
+__attribute__ ((format (printf, 3, 4)))
+#endif
+;
 
 /* Those must come first.  */
 typedef void builtin_func ();
--- m4-1.4/src/m4.c.orig	Tue Feb  6 11:34:09 2001
+++ m4-1.4/src/m4.c	Tue Feb  6 12:38:15 2001
@@ -369,7 +369,7 @@
 
       case 'o':
 	if (!debug_set_output (optarg))
-	  error (0, errno, optarg);
+	  error (0, errno, "%s", optarg);
 	break;
 
       case 's':
@@ -466,7 +466,7 @@
 	    fp = path_search (argv[optind]);
 	    if (fp == NULL)
 	      {
-		error (0, errno, argv[optind]);
+		error (0, errno, "%s", argv[optind]);
 		continue;
 	      }
 	    else