Package programs for NixOS

I need two programs packaged correctly for NixOS. The packages should take the online-sources as input - you can use either the .tar files or the .deb sources. You can find the tutorial as well as the links to the two programs at:

https://discourse.nixos.org/t/declare-evironment-systempackages-installation-of-a-tarball/23881

The project is succeeded, when I can install the herein described packages with "nix-env -i package.nix" and use the installed programs from my bash.