nixos-manager VS gi-atk

the version of GTK supported by gi-gtk is far from current, not to mention that gi-gtk itself, according to this discussion, isn't being as actively developed as it used to be.

You may want to check out this link. I have not checked it myself yet but it looks promising, although it looks like it has not been updated for some time.

As far as I can tell, I haven’t explicitly set extra-prog-path to anything in particular. haskell-gi’s package.cabal doesn’t seem to have this variable set either. If it does have some value out of the ordinary, I would have no idea how to figure that out.

gi-gtk (part of the haskell-gi project) is still actively maintained and it is in LTS 18.

Excellent news! For Windows, there’s some detailed documentation on installation, which I personally think is excellent. (Though I may be biased, since I wrote some of it myself!) For Linux, I remember installation being pretty simple last time I tried it (on an Ubuntu VM, as I already mentioned), though I haven’t attempted it again lately.

Followed https://github.com/haskell-gi/haskell-gi#mac-osx

For compilation there are instructions here that should be enough. We also had issues at run time about missing gsettings-schemas. We found a thread for another gtk application which solved our issues with these commands:

It worked. Long story short : upgraded everything, applied Github issue workaround, it worked.

Sorry, not a maintainer (that would be /u/garetxe, I think), just a satisfied user! And a Windows one to boot, so I wouldn’t know about Mac (though I have previously managed to build it on an Ubuntu VM). Perhaps try building it again and submit an issue if it doesn’t work; there’s some relevant documentation here and here which might help.