Gentoo's Bugzilla –
Attachment 652280 Details for
Bug 735172dev-haskell/transformers-compat-0.6.5 USE=profile - src/Control/Monad/Trans/Instances.hs:38:8: error: Could not find module ‘Prelude’ // Perhaps you haven't installed the profiling libraries for package ‘base-4.13.0.0’?