--- cdecl-2.5/cdecl.c.ewt	Fri Aug  9 15:46:58 1996

+++ cdecl-2.5/cdecl.c	Fri Aug  9 15:47:06 1996

@@ -63,6 +63,7 @@

 #include <stdio.h>

 #include <ctype.h>

 #if __STDC__ || defined(DOS)

+#include <errno.h>

 # include <stdlib.h>

 # include <stddef.h>

 # include <string.h>