Arf, OK, thanks. My mistake then. My reduction was incorrect. Indeed when I require 'ruby gems' first in macirb, there is no issue. But the issue remains in my MacRuby app. I get the following error when the app launches: /path/to/rb_main.rb:14: in `<main>': no such file to load -- sequel (LoadError) rb_main.rb read: framework 'Cocoa' require 'ruby gems' require 'sequel' # line 14 Of course I have installed the sequel gem with macgem, and I checked that I can require it in macirb (after rubygems). I suspect this is related to my install issue I described earlier. copying the MacRuby.framework from /Library/Frameworks to within Xcode wasn't good enough after all. (and again, this is all under Lion 10.7.4) So I am back to square one. Any suggestion for installing MacRuby 0.12? Regards, Jean-Denis On 12 juin 2012, at 15:55, <macruby-devel-request@lists.macosforge.org<mailto:macruby-devel-request@lists.macosforge.org>> Watson <watson1978@gmail.com<mailto:watson1978@gmail.com>> wrote: Message: 6 Date: Tue, 12 Jun 2012 22:52:36 +0900 From: Watson <watson1978@gmail.com<mailto:watson1978@gmail.com>> To: "MacRuby development discussions." <macruby-devel@lists.macosforge.org<mailto:macruby-devel@lists.macosforge.org>> Subject: Re: [MacRuby-devel] problem using gems with MacRuby 0.12 Message-ID: <CAL5q=W7WuLYJNVmcXrHKyNCQnDvrBAFFYzukpiwj0iAaPME6AA@mail.gmail.com<mailto:CAL5q=W7WuLYJNVmcXrHKyNCQnDvrBAFFYzukpiwj0iAaPME6AA@mail.gmail.com>> Content-Type: text/plain; charset=windows-1252 Hi, MacRuby does not load `rubygems' automatically. So, you need 'require "rubygems"' before loading gem which you want. Please refer to http://macruby.macosforge.org/trac/ticket/855 Thanks