One of my work-related fixes to GHC was merged; it basically fixes the old make-based build system for the GHC 9.4 branch. This will help you if you (A) patch GHC a lot and (B) build GHC with a lot of parallelism (both of which we do at work):
GHC 9.6 uses the new Hadrian-based build system, so it was unaffected by this issue.