Haskell stack build FLTKHS after changes

Question

Busy discovering Haskell libs. Found FLTKHS for GUI building. Its example fltks-hello-world works great as a skeleton for discovering the all the lib has to offer. However: when changing anything in the source file (fltkhs-hello-world.hs), does one need to stack build it all over? GHCi doesn't seem to grasp the FLTKHS imports, so the REPL is IMO no viable option. Interested in your way of working to learn....

Answer 1

Found out that future builds are way quicker. Not as fast as GHCi though...