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[gnulib.git] / m4 / netdb_h.m4

diff --git a/m4/netdb_h.m4 b/m4/netdb_h.m4
index 6ae1248..84afce6 100644 (file)
--- a/m4/netdb_h.m4
+++ b/m4/netdb_h.m4
@@ -1,5 +1,5 @@
-# netdb_h.m4 serial 4
-dnl Copyright (C) 2008 Free Software Foundation, Inc.
+# netdb_h.m4 serial 6
+dnl Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -7,10 +7,17 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_HEADER_NETDB],
 [
   AC_REQUIRE([gl_NETDB_H_DEFAULTS])
+  AC_CHECK_HEADERS_ONCE([netdb.h])
   gl_CHECK_NEXT_HEADERS([netdb.h])
   if test $ac_cv_header_netdb_h = yes; then
-    AC_CHECK_TYPES([struct addrinfo], [NETDB_H=''], [NETDB_H='netdb.h'],
-                   [[#include <netdb.h>]])
+    AC_COMPILE_IFELSE(
+      [AC_LANG_PROGRAM([[
+         #include <netdb.h>
+         struct addrinfo a;
+         int b = EAI_OVERFLOW;
+         int c = AI_NUMERICSERV;
+       ]])],
+      [NETDB_H=''], [NETDB_H='netdb.h'])
     HAVE_NETDB_H=1
   else
     NETDB_H='netdb.h'