diff -ur --unidirectional-new-file skipsrc-1.0.orig/certs/lib/test_ca.C work.new/certs/lib/test_ca.C
--- skipsrc-1.0.orig/certs/lib/test_ca.C	Fri Oct 25 13:11:50 1996
+++ work.new/certs/lib/test_ca.C	Mon Jan 24 12:35:37 2000
@@ -46,6 +46,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 #include <sys/types.h>
 #include "Time.h"
 #include "Bigint.h"