In D1619#143908, @Stan wrote:

Well it's a bit different. Also we have no one with a ppc64 around.

Thanks for the detailed instructions! Patchset has been updated.

Move spidermonkey and nvtt patches into dedicated patch files
Fix copyright lines per instructions

Add omitted copyright line

Screenshot from working build: https://imgur.com/a/Jvclj0j

Requires http://trac.wildfiregames.com/ticket/5292 . This is why libraries/source/spidermonkey/mozjs-38.2.1.rc0.tar.bz2 has been flagged as needing changes.