* ext/socket/extconf.rb: Check socketpair again.

It is required on Unix.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40695 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon May 13 21:49:17 2013  Tanaka Akira  <akr@fsij.org>
+
+	* ext/socket/extconf.rb: Check socketpair again.
+	  It is required on Unix.
+
 Mon May 13 21:20:32 2013  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/win32.c (getipaddrs): use alternamtive interface name if

ext/socket/extconf.rb

@@ -426,6 +426,7 @@ EOF
   have_func("hsterror", headers)
   have_func('getipnodebyname("", 0, 0, (int *)0)', headers) # RFC 2553
   have_func('gethostbyname2("", 0)', headers) # RFC 2133
+  have_func("socketpair(0, 0, 0, 0)", headers)
   unless have_func("gethostname((char *)0, 0)", headers)
     have_func("uname((struct utsname *)NULL)", headers)
   end