Please note that this add-on is still in development and is not guaranteed to work on your machine. Proceed at your own risk.
To get started, make sure you have a copy of the OpenELEC source and it's at the 4.0.7 release.
$ git clone -b 4.0.7 https://github.com/OpenELEC/OpenELEC.tv.git
Read OpenELEC's compile from source article, to make sure you have all the build dependencies: http://wiki.openelec.tv/index.php?title=Compile_from_source
Next, clone this repo and run the build_addon.sh script. Select the options applicable to you, then go grab a coffee and wait for the add-on to build.