Compile command-t vim plugin with homebrew and macvim

As a non-ruby guy, I spent too much time figuring out... If you are getting this error while trying to launch Vim:

Vim: Caught deadly signal SEGV
Vim: Finished.
Segmentation fault: 11

Your Ruby system version does not match the one MacVim was used to compile. One of the options is use the same MacVim Ruby version to recompile command-t:

brew install ruby192
cd ~/.vim/bundle/command-t/ruby/command-t/
/usr/local/Cellar/ruby192/1.9.2-p320/bin/ruby extconf.rb
/usr/local/Cellar/ruby192/1.9.2-p320/bin/rake make

This works for me, it might not for you.