I am having following errors while installing MM

Cloning MagicMirror Done!
Installing dependencies ...
npm WARN prefer global coffeescript@1.10.0 should be installed with -g
npm WARN prefer global jsonlint@1.6.2 should be installed with -g

> uws@0.14.5 install /home/pi/MagicMirror/node_modules/uws
> node-gyp rebuild > build_log.txt 2>&1 || exit 0


Unable to install dependencies!
pi@raspberrypi:~ $