In truth I couldn't tell you how to make it, I think few have. I would ask at the aroma thread being the created did.
But being its rather complicated I would suggest just pulling the latest one from a ROM on your device or use the one that comes with the latest gapps or aroma package.
If you want to know more about updater-script commands,edify, see here
Sent from my Nexus 7 using XDA Premium 4 mobile app
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