/home/vagrant/.cabal/bin should be in /home/vagrant/bin:/home/vagrant/.cabal/bin:/home/vagrant/bin:/home/vagrant/bin:/home/vagrant/bin:/home/vagrant/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/opt/vagrant_ruby/bin:/opt/vagrant_ruby/bin