Debian wheezy/sid amd64 + rbenv (deb) + ruby-build (git) で Ruby 2.0.0 preview2 をビルドしてみた
cowbuilder内で:
% sudo apt-get install rbenv curl autoconf libgdbm-dev libncursesw5-dev libncurses5-dev libreadline6-dev zlib1g-dev libssl-dev libffi-dev
% git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
% rbenv install 2.0.0-preview2