*/
#include <sys/types.h>
-#if (defined(VMS) || defined(__VMS)) && !defined(FD_SET)
+#include <openssl/opensslconf.h>
+
+#if defined(OPENSSL_SYS_VMS) && !defined(FD_SET)
/* VAX C does not defined fd_set and friends, but it's actually quite simple */
/* These definitions are borrowed from SOCKETSHR. /Richard Levitte */
#define MAX_NOFILE 32