From 7c93e565600f3645659e603161c9ac992184c7d0 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 7 Feb 2009 02:44:07 +0000
Subject: [PATCH] * lib/mkmf.rb (have_header): needs dependent headers if
 trying to   compile.

* ext/socket/extconf.rb: net/if.h depends on other headers.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22103 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog             | 7 +++++++
 ext/socket/extconf.rb | 2 +-
 lib/mkmf.rb           | 4 ++--
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 67519524fb..ab83cb0734 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Sat Feb  7 11:44:06 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/mkmf.rb (have_header): needs dependent headers if trying to
+	  compile.
+
+	* ext/socket/extconf.rb: net/if.h depends on other headers.
+
 Sat Feb  7 04:02:37 2009  Tanaka Akira  <akr@fsij.org>
 
 	* dir.c (dir_read): don't disable rdoc.
diff --git a/ext/socket/extconf.rb b/ext/socket/extconf.rb
index 63a8577c2e..a0a4f8e9f7 100644
--- a/ext/socket/extconf.rb
+++ b/ext/socket/extconf.rb
@@ -291,7 +291,7 @@ have_header("ifaddrs.h")
 have_func("getifaddrs")
 have_header("sys/ioctl.h")
 have_header("sys/sockio.h")
-have_header("net/if.h")
+have_header("net/if.h", headers)
 
 unless have_type("socklen_t", headers)
   $defs << "-Dsocklen_t=int"
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 2cbbb245a9..2a49b6fc8f 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -808,9 +808,9 @@ end
 # For example, if have_header('foo.h') returned true, then the HAVE_FOO_H
 # preprocessor macro would be passed to the compiler.
 #
-def have_header(header, &b)
+def have_header(header, preheaders = nil, &b)
   checking_for header do
-    if try_header(cpp_include(header), &b)
+    if try_header(cpp_include(preheaders)+cpp_include(header), &b)
       $defs.push(format("-DHAVE_%s", header.tr("a-z./\055", "A-Z___")))
       true
     else