From: "drbrain (Eric Hodel)" Date: 2013-02-22T11:33:54+09:00 Subject: [ruby-core:52672] [ruby-trunk - Bug #7897][Closed] rubygems 2.0 has an incompatibility about installation of extension libraries if gem package does not contain lib directory Issue #7897 has been updated by drbrain (Eric Hodel). Status changed from Assigned to Closed Assignee changed from nobu (Nobuyoshi Nakada) to drbrain (Eric Hodel) % Done changed from 50 to 100 Then RubyGems breaks mkmf.rb's Makefile and Murata-san's patch fixes it. Thank you for checking! ---------------------------------------- Bug #7897: rubygems 2.0 has an incompatibility about installation of extension libraries if gem package does not contain lib directory https://bugs.ruby-lang.org/issues/7897#change-36758 Author: mrkn (Kenta Murata) Status: Closed Priority: Urgent Assignee: drbrain (Eric Hodel) Category: lib Target version: 2.0.0 ruby -v: ruby 2.0.0dev (2013-02-08 trunk 39161) [x86_64-darwin11.4.2] Hi, rubygems 2.0 has an incompatibility about installation of extension libraries. If a gem package does not contain lib directory, an extension library file is copied as a file named "lib". You can reproduce this problem by installing msgpack version 0.4.7. -- http://bugs.ruby-lang.org/