--- cpio-2.4.2/userspec.c.glibc21	Thu Dec  3 04:09:07 1998
+++ cpio-2.4.2/userspec.c	Thu Dec  3 04:09:37 1998
@@ -82,8 +82,6 @@
 
 #define isdigit(c) ((c) >= '0' && (c) <= '9')
 
-char *strdup ();
-
 /* Return nonzero if STR represents an unsigned decimal integer,
    otherwise return 0. */