How to install libsForQt5.oxygen in NixOS 25.11?

emanuel · December 21, 2025, 2:47pm

I use KDE with the Oxygen theme, but when I upgraded NixOS from 25.05 to 25.11, I had to give up on the libsForQt5.oxygen package because it wasn’t available anymore. Now Qt5 based applications use the Breeze theme instead of the Oxygen one and look out of place. Is there any way to install libsForQt5.oxygen in 25.11?

waffle8946 · December 21, 2025, 9:43pm

Seems like there’s a kdePackages.oxygen^qt5, not sure if that helps you.

github.com/NixOS/nixpkgs

pkgs/kde/plasma/oxygen/default.nix

b3aad4686

{
  mkKdeDerivation,
  qtbase,
  libsForQt5,
}:
mkKdeDerivation {
  pname = "oxygen";

  outputs = [
    "out"
    "dev"
    "qt5"
  ];

  # We can't add qt5 stuff to dependencies or the hooks blow up,
  # so manually point everything to everything. Oof.
  extraCmakeFlags = [
    "-DQt5_DIR=${libsForQt5.qtbase.dev}/lib/cmake/Qt5"
    "-DQt5Core_DIR=${libsForQt5.qtbase.dev}/lib/cmake/Qt5Core"
    "-DQt5DBus_DIR=${libsForQt5.qtbase.dev}/lib/cmake/Qt5DBus"

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emanuel · December 22, 2025, 6:11pm

Sorry, but I’m still very inexperienced in nix and NixOS and I don’t know how to use that information. Is there a way to state that I want to add the Qt5 version of oxygen in /etc/nixos/configuration.nix?

Thank you in advance for your patience.