Aditya Siram

I personally never understood why `Fl_Overlay_Window` was useful over just overriding the `draw` of `Fl_Double_Window`. And there seem to be other ways of doing [offscreen drawing](https://github.com/fltk/fltk/blob/master/test/offscreen.cxx) for smoother graphics as...

`fltkhs` does not currently work with Nix and the `cabal2nix` utility fails because it has a non-trivial `Setup.hs` Cabal build script. I know almost nothing about Nix and it would...

You're right, I'm seeing the same behavior. Please run `fltkhs-tree-simple` for a better demonstration of the tree widget. The corresponding source is in `src/Examples/tree-simple.hs`. Thanks for the bug report!

Nice, thanks! Does it still work if you enable the `OpenGL` flag?

Cool! That last error is possibly a good sign. Try removing the local `.stack-work` directory, doing a `stack clean` and then `stack build`. I would also check that the `fltk`...

Hi, Thanks for the report! Unfortunately I am unable to reproduce the crash on my Debian box, but what I do see is a window with a blank box. The...

Yes there is a way. In this case you could start with the docs for [Box](https://hackage.haskell.org/package/fltkhs-0.5.4.5/docs/Graphics-UI-FLTK-LowLevel-Box.html) and click the link for `Widget` in the hierarchy diagram and [widget functions](https://hackage.haskell.org/package/fltkhs-0.5.4.5/docs/Graphics-UI-FLTK-LowLevel-Box.html) will...

Yes it does require the [development version of FLTK](http://hackage.haskell.org/package/fltkhs-0.6.0.0/docs/Graphics-UI-FLTK-LowLevel-FLTKHS.html#g:5). I'll add it to the README since other people missed this as well so it's obviously not prominent enough.

Thanks for the help with Nix packaging, learned a lot looking at your PR!

I have a guess as to why the problem is occuring but don't have a fix because I don't know Nix. When building `fltkhs`, the C bindings are [built separately](https://github.com/deech/fltkhs/blob/master/Setup.hs#L110),...