From 1a1c0aeb50d3faa919db178e7d237dd5388e6710 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 5 Dec 2013 13:18:07 +0000
Subject: [PATCH] mkmf.rb: strip destdir from prefix

* lib/mkmf.rb (configuration): strip destdir part from prefix to get
  rid of duplication.  a patch by arton at [ruby-core:58859].
  [ruby-core:58856] [Bug #9213]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44019 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog   | 6 ++++++
 lib/mkmf.rb | 1 +
 2 files changed, 7 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index b5cc46169e..e2e057a75e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu Dec  5 22:18:01 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/mkmf.rb (configuration): strip destdir part from prefix to get
+	  rid of duplication.  a patch by arton at [ruby-core:58859].
+	  [ruby-core:58856] [Bug #9213]
+
 Thu Dec  5 21:53:29 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* array.c (rb_ary_or): lhs elements are prefered, so should not
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index a3a39dfe3c..c4e2e5a900 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1849,6 +1849,7 @@ VPATH = #{vpath.join(CONFIG['PATH_SEPARATOR'])}
     prefix = mkintpath(CONFIG["prefix"])
     if destdir = prefix[$dest_prefix_pattern, 1]
       mk << "\nDESTDIR = #{destdir}\n"
+      prefix = prefix[destdir.size..-1]
     end
     mk << "prefix = #{with_destdir(prefix).unspace}\n"
     CONFIG.each do |key, var|