Add sys/types include for sockaddr test to configure

config/c-library.m4

 # Macros that test various C library quirks
-# $Header: /cvsroot/pgsql/config/c-library.m4,v 1.2 2000/09/27 15:17:52 petere Exp $
+# $Header: /cvsroot/pgsql/config/c-library.m4,v 1.3 2000/10/02 03:55:15 momjian Exp $
 
 
 # PGAC_VAR_INT_TIMEZONE
@@ -60,6 +60,9 @@ fi])# PGAC_UNION_SEMUN
 # char sun_path[108]; }. (Requires test for <sys/un.h>!)
 AC_DEFUN([PGAC_STRUCT_SOCKADDR_UN],
 [AC_CACHE_CHECK([for struct sockaddr_un], pgac_cv_struct_sockaddr_un,
+[AC_TRY_COMPILE([#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif],
 [AC_TRY_COMPILE([#ifdef HAVE_SYS_UN_H
 #include <sys/un.h>
 #endif],