Include <sys/types.h>.

src/server/aux-item-def-scan.l

 %{
 /*
- * $Id: aux-item-def-scan.l,v 1.4 1999/05/24 09:34:18 ceder Exp $
+ * $Id: aux-item-def-scan.l,v 1.5 1999/06/25 21:20:17 ceder Exp $
  * Copyright (C) 1994-1996, 1999  Lysator Academic Computer Association.
  *
  * This file is part of the LysKOM server.
@@ -28,6 +28,7 @@
 #  include <config.h>
 #endif
 
+#include <sys/types.h>
 #include <ctype.h>
 
 /* Rename hack from the automake 1.4 manual. */