typegen and orogen missing metaruby (build from source on 14.04+rtt2.8)

Hello,

I'm facing an issue with typegen if orocos is built form source (isolated build).

 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- metaruby/dsls/doc (LoadError)
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /home/hoarau/ros_ws/orocos_ws/install/lib/ruby/1.9.1/orogen.rb:40:in `<top (required)>'
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /home/hoarau/ros_ws/orocos_ws/install/bin/typegen:2:in `0'
Its missing metaruby from https://github.com/rock-core/tools-metaruby

If I clone https://github.com/orocos-gbp/metaruby-release.git in my orocos isolated workspace and build/install it, it works.

Shouldn't metaruby be included in the orocos-toolchain ?