Fixes compilation of example on nixos

[Niedzwiedzw]

Fixes #1992

[garrettjwilke]

hello! i am trying to test this, but i am unsure the correct steps.

i am very unfamiliar with proper nix steps and setup...can you provide details for me to get this built in a nix environment?

thanks! :)

[Niedzwiedzw]

so if you have nix package manager you should be able to just run 'nix develop' when cd'd here and everything should be set up (all dependencies downloaded and symlinked so that they are in $PATH)

[garrettjwilke]

added nix package manager, and attempted nix develop with this PR checked out:

error: experimental Nix feature `nix-command` is disabled; add `--extra-experimental-features nix-command` to enable it

so i ran:

nix --extra-experimental-features nix-command develop

it gave this:

error: experimental Nix feature `flakes` is disabled; add `--extra-experimental-features flakes` to enable it

next ran this:

nix --extra-experimental-features nix-command develop --extra-experimental-features flakes

it then added everything required presumably...but the build failed:

cargo run --example customized-window-decorations

and it built mostly and at the end gave this error (see attached nix.txt)
nix.txt

so i am unsure if this is "working" or not :)

it was not as simple as running nix develop