Since quite some time I keep splitting/cleaning up/rebasing and fixing the 2 year old PowerPC64le patchset from 2019 (done by Timothy Pearson): [1]
The goal is to have a winelib base for Hangover [2] on PowerPC64 and there's also interest in having winelib for crosscompiling [3].
This rebase meanwhile matured, especially end of last year, and I hope it can get upstreamed now that wine-6.0 is out and the patch flood after it calmed down a bit.
[1] https://github.com/madscientist159/wine/commits/master [2] https://github.com/AndreRH/hangover [3] https://wiki.raptorcs.com/wiki/Porting/Wine