I forked the official openlayers repo, and I followed the instructions from here to make a local build, but i get the following error when i run 'make build':
node tasks/build.js config/ol.json build/ol.js
info ol Parsing dependencies
ERR! SyntaxError: Unterminated string constant (10:2)
D:\openlayers\openlayers\src\ol\render\webgl\circlereplay\defaultshader.js:10
  'pre
  ^
make: *** [Makefile:243: build/ol.js] Error 1
My environment consists in :
- Windows 8.1
 - Cygwin 2.8.2
 - GNU Make 4.2.1
 - Python 2.7.13
 - npm 3.10.10
 - Java 1.8.0_131-b11