mkmf.rb: adjust default library path

* lib/mkmf.rb (MakeMakefile#init_mkmf): adjust default library path
  for multiarch.  [Bug #7874]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39371 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Fri Feb 22 11:33:42 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/mkmf.rb (MakeMakefile#init_mkmf): adjust default library path
+	  for multiarch.  [Bug #7874]
+
 Fri Feb 22 11:10:00 2013  Zachary Scott  <zachary@zacharyscott.net>
 
 	* enum.c (Enumerable#chunk: Improved examples, grammar, and formatting

lib/mkmf.rb

@@ -2339,7 +2339,7 @@ site-install-rb: install-rb
     $LIBRUBYARG = ""
     $LIBRUBYARG_STATIC = config['LIBRUBYARG_STATIC']
     $LIBRUBYARG_SHARED = config['LIBRUBYARG_SHARED']
-    $DEFLIBPATH = [$extmk ? "$(topdir)" : "$(libdir)"]
+    $DEFLIBPATH = [$extmk ? "$(topdir)" : "$(#{config["libdirname"]})"]
     $DEFLIBPATH.unshift(".")
     $LIBPATH = []
     $INSTALLFILES = []