On windows, if you are using Visual Studio 2012, you will have to manually specify the Visual Studio version on node-gyp otherwise you will get an error: "error MSB8020: The builds tools for Visual Studio 2010 (Platform Toolset = 'v100') cannot be found". In order to get pass this error, modify the custom_rules.xml file and add the "--msvs_version=2012" argument in the npm command (line 30) by adding the following line:
<arg line="--msvs_version=2012"/>