This was helpful. Specifically this line.waebbl wrote: ↑Sun Aug 25, 2019 4:24 pm You can take a look at my overlay at https://github.com/waebbl/waebbl-gentoo on how I am configuring Coin and SoQt to compile pivy and FreeCAD.
All I needed to get this to compile properly was to touch these "fake_headers".
I'm left with lots of questions - why are "fake headers" needed? Why aren't the full set up them included from upstream?
But, alas, perhaps those are questions for another day...