I'm getting this libraries/time/lib/Data/Time/Clock/Internal/SystemTime.hs:1:14: warning: [-Wtrustworthy-safe] 'Data.Time.Clock.Internal.SystemTime' is marked as Trustworthy but has been inferred as safe! | 1 | {-# LANGUAGE Trustworthy #-} | ^^^^^^^^^^^ Since I use -Werror in stage2, my build fails. Simon