Error loading gem paths on load path in gem_prelude can't modify frozen string <internal:gem_prelude>:69:in `force_encoding' <internal:gem_prelude>:69:in `set_home' <internal:gem_prelude>:38:in `dir' <internal:gem_prelude>:76:in `set_paths' <internal:gem_prelude>:47:in `path' <internal:gem_prelude>:286:in `push_all_highest_version_gems_on_load_path' that bug might happen during the installation of rubygems, resulting in loads of crap directories created in / and auto_gem.rb not installed. That patch should be in the patchset until upstream fix that.
is in 1.9.2