From b528172ebaa284f26fca5f3bc8ea3044d0263d21 Mon Sep 17 00:00:00 2001
From: usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 20 Apr 2015 07:52:10 +0000
Subject: [PATCH] * lib/mkmf.rb (MakeMakefile#configuration): DESTDIR should
 never affect   top_srcdir and builddir.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50355 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog   | 5 +++++
 lib/mkmf.rb | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index dc4785bee9..f8fe1307a3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Apr 20 16:49:52 2015  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* lib/mkmf.rb (MakeMakefile#configuration): DESTDIR should never affect
+	  top_srcdir and builddir.
+
 Mon Apr 20 16:18:17 2015  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* common.mk ($(arch)-fake.rb): fix the path separator up for Windows.
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 044d72777a..0f588a56ee 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1915,7 +1915,7 @@ VPATH = #{vpath.join(CONFIG['PATH_SEPARATOR'])}
       next if /^abs_/ =~ key
       next if /^(?:src|top|hdr)dir$/ =~ key
       next unless /dir$/ =~ key
-      mk << "#{key} = #{with_destdir(var)}\n"
+      mk << "#{key} = #{/^(?:top_src|build)dir$/ =~ key ? var : with_destdir(var)}\n"
     end
     if !$extmk and !$configure_args.has_key?('--ruby') and
         sep = config_string('BUILD_FILE_SEPARATOR')