Here's another instance of the machine (*) telling me what to do, instead of doing it (or am I missing something): I have a large set of cabal packages installed with ghc. Then suddenly I need some package Foo with profiling. So I switch to library-profiling: True in my .cabal/config, and then "cabal install Foo" - failing with the message: Perhaps you haven't installed the profiling libraries for package `Bar' for some package Bar that Foo depends upon. - Dear Cabal: Yes! I know that I haven't installed them! I want you to install them for me! But it isn't listening ... (*) "machine" = everything in that metal box that was so expensive and has a lot of cables coming out, and ventilators running. Of course you know that I have the highest respect for the work of the cabal authors. I'm just suggesting that the above feature (auto-re-install dependencies) would be helpful. Perhaps it's already there? If not - would it be hard to specify? To build? Or would it have bad consequences? Is it "cabal upgrade --reinstall"? But that was deprecated? Here I really want "reinstall with exactly the same versions". Is it the problem that their sources may have vanished, meanwhile? Could it be solved by having "cabal install" storing a copy of the source package that it used? Thanks - J.W.