{
  nixpkgs.overlays = [
    (self: super: {
      usermgr = self.callPackage ../packages/usermgr { };

      scalasca = self.callPackage ../packages/scalasca { };
      scorep = self.callPackage ../packages/scorep { };

      openmpi = self.callPackage ../packages/openmpi { };

      pdtoolkit = self.callPackage ../packages/pdtoolkit { };
      tau = self.callPackage ../packages/tau { };

      ucx = super.ucx.overrideAttrs (final: prev: rec {
        version = "1.16.0";

        src = self.fetchFromGitHub {
          owner = "openucx";
          repo = "ucx";
          rev = "v${version}";
          hash = "sha256-dihWwGlQclfa2ke+1V5c6coqfFjjuMyI8QRzNdx33zQ=";
        };
      });
    })
  ];
}