mitchellh/vagrant-installers — pull request #13 by hradtke (2012-08-02 23:17:27+00:00)
Title: Fix errors when `uname -o` is not a valid command

Fix the following error on *nix distros that do not support the -o option for uname:
$ vagrant up
uname: invalid option -- o
Try `uname --help' for more information.
/c/vagrant/vagrant/bin/vagrant: line 34: [: =: unary operator expected