According to documentation, including time.h declares select() on

OpenVMS, and possibly more.

Ref: http://h71000.www7.hp.com/doc/82final/6529/6529pro_019.html#r_select

apps/ocsp.c

@@ -59,6 +59,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <time.h>
 #include "apps.h"
 #include <openssl/pem.h>
 #include <openssl/ocsp.h>