On 2016-10-01 at 03:05:23 +0200, Tillmann Rendel wrote: [...]
I'm aware why `cabal install gtk3` can neither install gtk2hs-buildtools nor install the C library
If you're referring to `cabal` not being able to solve for build-tools and installing them: that's being addressed in 'cabal new-build', right now latest cabal new-build can already install the well-known build-tools (alex, happy, etc...). If you want cabal to install C libraries, you have to package them as Cabal packages first. I did that e.g. with http://hackage.haskell.org/package/lzma-clib for Windows' sake, but it's still an unsatisfying workaround for lack of a proper system package management for C libraries in Windows. I hope that something like Chocolatey will become the de-facto standard on Windows in the foreseeable future.