usa	2014-12-24 00:32:37 +0900 (Wed, 24 Dec 2014)

  New Revision: 48945

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=48945

  Log:
    * tool/extlibs.rb (do_extract): decompress!

  Modified files:
    trunk/tool/extlibs.rb
Index: tool/extlibs.rb
===================================================================
--- tool/extlibs.rb	(revision 48944)
+++ tool/extlibs.rb	(revision 48945)
@@ -41,13 +41,13 @@ def do_extract(cache, dir) https://github.com/ruby/ruby/blob/trunk/tool/extlibs.rb#L41
   ext = File.extname(cache)
   case ext
   when '.gz', '.tgz'
-    f = IO.popen(["gzip", "-c", cache])
+    f = IO.popen(["gzip", "-dc", cache])
     cache = cache.chomp('.gz')
   when '.bz2', '.tbz'
-    f = IO.popen(["bzip2", "-c", cache])
+    f = IO.popen(["bzip2", "-dc", cache])
     cache = cache.chomp('.bz2')
   when '.xz', '.txz'
-    f = IO.popen(["xz", "-c", cache])
+    f = IO.popen(["xz", "-dc", cache])
     cache = cache.chomp('.xz')
   else
     inp = cache

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