Forum: Ruby-Gnome 2 i can't compile rbbr

hi,

* subversion update start -->
  *      repository:
https://ruby-gnome2.svn.sourceforge.net/svnroot/ruby-gnome2/rbbr/trunk
At revision 3782.
  *    working copy: /usr/portage/distfiles/svn-src/rbbr/trunk

 >>> Source unpacked in /dev/shm/portage/dev-ruby/rbbr-9999/work
 >>> Compiling source in
/dev/shm/portage/dev-ruby/rbbr-9999/work/rbbr-9999 ...
/usr/lib64/ruby/site_ruby/1.8/rubygems/defaults/operating_system.rb:25:in 
`ruby_engine':
uninitialized constant Module::RUBY_DESCRIPTION (NameError)
     from /usr/lib64/ruby/site_ruby/1.8/rubygems/defaults.rb:36:in
`user_dir'
     from
/usr/lib64/ruby/site_ruby/1.8/rubygems/defaults/operating_system.rb:15:in 
`default_path'
     from /usr/lib64/ruby/site_ruby/1.8/rubygems.rb:635:in `path'
     from /usr/lib64/ruby/site_ruby/1.8/rubygems/source_index.rb:68:in
`installed_spec_directories'
     from /usr/lib64/ruby/site_ruby/1.8/rubygems/source_index.rb:58:in
`from_installed_gems'
     from /usr/lib64/ruby/site_ruby/1.8/rubygems.rb:883:in 
`source_index'
     from
/usr/lib64/ruby/site_ruby/1.8/rubygems/gem_path_searcher.rb:81:in
`init_gemspecs'
     from
/usr/lib64/ruby/site_ruby/1.8/rubygems/gem_path_searcher.rb:13:in
`initialize'
     from /usr/lib64/ruby/site_ruby/1.8/rubygems.rb:841:in `new'
     from /usr/lib64/ruby/site_ruby/1.8/rubygems.rb:841:in `searcher'
     from /usr/lib64/ruby/site_ruby/1.8/rubygems.rb:840:in `synchronize'
     from /usr/lib64/ruby/site_ruby/1.8/rubygems.rb:840:in `searcher'
     from /usr/lib64/ruby/site_ruby/1.8/rubygems.rb:479:in `find_files'
     from /usr/lib64/ruby/site_ruby/1.8/rubygems.rb:983:in 
`load_plugins'
     from /usr/lib64/ruby/site_ruby/1.8/rubygems.rb:1139
     from /usr/lib64/ruby/site_ruby/1.8/auto_gem.rb:5:in `require'
     from /usr/lib64/ruby/site_ruby/1.8/auto_gem.rb:5
  * ERROR: dev-ruby/rbbr-9999 failed:
  *   install.rb config failed

ruby -v
ruby 1.8.6 (2010-01-11 patchlevel 388) [x86_64-linux]

anyone seen this?
thanks in advice

sorry, i guess it'll be a gentoo specific bug of the package rubygems.