Ubuntu / Linux

Install Crystal-Lang

curl https://dist.crystal-lang.org/apt/setup.sh | sudo bash
sudo apt-get install crystal

Debian / Ubuntu

For other OSes and distros check the official documentation.

https://yarnpkg.com/en/docs/install#linux-tab

Install Yarn

curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list

Install Gulp

npm install --global gulp-cli