Builded it locally, but execution doesn't work for me:

/nix/store/sl5r2n3zxv9d0qmx65arh5y9rzv8lrzz-kapow-1.5.9/bin/kapow

(process:13658): GLib-GIO-ERROR **: 21:50:48.873: No GSettings schemas are installed on the system
Trace/breakpoint trap (core dumped)

Also you should make two commits, one for the package, one for adding yourself in maintainers.

The commit message for adding the package would be: kapow: init at 1.5.9

Hello, I'm a bot and I thank you in the name of the community for your contributions.

Nixpkgs is a busy repository, and unfortunately sometimes PRs get left behind for too long. Nevertheless, we'd like to help committers reach the PRs that are still important. This PR has had no activity for 180 days, and so I marked it as stale, but you can rest assured it will never be closed by a non-human.

If this is still important to you and you'd like to remove the stale label, we ask that you leave a comment. Your comment can be as simple as "still important to me". But there's a bit more you can do:

If you received an approval by an unprivileged maintainer and you are just waiting for a merge, you can @ mention someone with merge permissions and ask them to help. You might be able to find someone relevant by using Git blame on the relevant files, or via GitHub's web interface. You can see if someone's a member of the nixpkgs-committers team, by hovering with the mouse over their username on the web interface, or by searching them directly on the list.

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Split the maintainers file commit.

I have set myself as the maintainer because the change to maintainers list seemed invalid: azimov.rocks email domain is not registered and 0x769C79DA5C9B038A PGP key is not published. @0x450x6c, please add yourself to maintainers if you still wish to maintain this package (and be notified of its issues and pull requests that edit its definition).

What about merge it and include @0x450x6c in a future commit?

OK.