You can install the requirements easily by executing the following scripts using curl & bash:
All requirements except yarn are met, out of the box.
curl -o- -L https://yarnpkg.com/install.sh | bashmacOS — Homebrew
curl https://raw.githubusercontent.com/gae-init/gae-init/master/bin/requirements_osx_brew.sh | bashmacOS — MacPorts
curl https://raw.githubusercontent.com/gae-init/gae-init/master/bin/requirements_osx_port.sh | bashcurl https://raw.githubusercontent.com/gae-init/gae-init/master/bin/requirements_linux.sh | bash