How to update

Extract it: tar xvf ~/work/defold/share/ext/box2d/box2d.tar.gz

Copy it:

bash

mv box2d-28adacf82377d4113f2ed00586141463244b9d10/include Box2D/include
mv box2d-28adacf82377d4113f2ed00586141463244b9d10/src Box2D/src

Patch it: (cd Box2D && patch --binary -p1 < ../patch_28adacf82377d4113f2ed00586141463244b9d10)