diff -Nurd '-x*~' msub-1.13.orig/msub.c msub-1.13/msub.c
--- msub-1.13.orig/msub.c	1997-04-02 17:35:23.000000000 -0500
+++ msub-1.13/msub.c	2012-02-15 14:28:44.000000000 -0500
@@ -46,11 +46,8 @@
 # define	FromMakefile(vp)	(vp->source == precMakefile)
 
 
-extern char	*malloc ();
-extern char	*strcpy ();
-extern char	*strncpy ();
-extern char	*strcat ();
-extern char	*getenv ();
+# include	<stdlib.h>
+# include	<string.h>
 
 
 typedef	struct Var	Var;