Good news! DevilutionX v1.0.1 actually does compile successfully on Linux 5.5.0 ppc64le (my box is Fedora 32 rawhide).
There was one issue with libsodium's Findsodium.cmake script that failed to detect my libsodium which is now resolved in 1.0.1.
The game plays perfectly, I am going to spend sometime packaging this app up and chuck the RPM build to Fedora COPR
Video:
https://www.youtube.com/watch?v=voVUNkfmZcw