$ rake
(in /home/clgc/languages/rubinius-cpp)
/usr/bin/ruby1.8 lib/compiler/mri_compile.rb -frbx-safe-math -frbx-kernel kernel/core/immediate.rb runtime/core/kernel/core/immediate.rbc
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require': no such file to load -- ./lib/compiler/../../vm/gen/simple_field (LoadError)
        from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
        from ./lib/compiler/mri_shim.rb:47
        from lib/compiler/mri_compile.rb:3:in `require'
        from lib/compiler/mri_compile.rb:3
rake aborted!
Command failed with status (1): [/usr/bin/ruby1.8 lib/compiler/mri_compile....]

(See full trace by running task with --trace)