Instructions to work on OSX 10.11.4 (El Capitan).
brew install imagemagick
brew install graphicsmagick
brew install ghostscript
git clone https://github.com/matthewdordal/GraphicsMagick-Example.git
cd GraphicsMagick-Example
npm install
node app --text="manatee meme" > gm.html ; open gm.html
A gm.html file will be created and opened in the default browser that displays the image with text overlayed on it.