nobu	2015-07-10 10:22:55 +0900 (Fri, 10 Jul 2015)

  New Revision: 51205

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=51205

  Log:
    extmk.rb: silently skip never-installed extensions
    
    * ext/extmk.rb (extmake): as extension libraries start with '-'
      are not installed always, no problems if no errors occurred.

  Modified files:
    trunk/ext/extmk.rb
Index: ext/extmk.rb
===================================================================
--- ext/extmk.rb	(revision 51204)
+++ ext/extmk.rb	(revision 51205)
@@ -257,6 +257,8 @@ def extmake(target) https://github.com/ruby/ruby/blob/trunk/ext/extmk.rb#L257
 	f.print(*dummy_makefile(CONFIG["srcdir"]))
       end
 
+      return true if !error and target.start_with?("-")
+
       mess = "Failed to configure #{target}. It will not be installed.\n"
       if error
         mess = "#{error}\n#{mess}"

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