compile vim with ruby support
# get source
wget ftp://ftp.vim.org/pub/vim/unix/vim-7.3.tar.bz2
tar -xjvf vim-7.3.tar.bz2
# make sure using the system ruby version
cd vim73
rvm use system
# compile
./configure --prefix=/usr/local \
--enable-gui=no \
--without-x \
--disable-nls \
--enable-multibyte \
--with-tlib=ncurses \
--enable-pythoninterp \
--enable-rubyinterp \
--with-ruby-command=/usr/bin/ruby \
--with-features=huge
make
sudo make install