Given stack --arch i386 --no-terminal --install-ghc build, that produces about 20K lines of output of the form Extracting .... That level of output makes it impossible to find anything in my console, and also means that for CI system (e.g. appveyor) it becomes ridiculously sluggish to navigate. Perhaps pass a quieter option to 7zip? Updates every 10 seconds on how many files have been extracted so far would be fine, or a . for each file, or something else.