OSX intstructions
First, make sure you have xcode installed:
xcode-select --install
devenv for OSX requires that you install homebrew before running the
installation script.
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
ensure you have git and brew installed
type git
type brew
UBUNTU instructions
ensure you have git installed
type git