dan4ik@nixos ~> sudo nixos-rebuild switch
building Nix…
building the system configuration…
error: Package ‘osu-lazer-2020.1225.0’ in /nix/store/vsvcwr94f3s4gx1gzkllqxvvzms24xw5-unstable-21.03pre260232.733e537a8ad/unstable/pkgs/games/osu-lazer/default.nix:107 has an unfree license (‘mit cc-by-nc-40 unfreeRedistributable’), refusing to evaluate.
a) To temporarily allow unfree packages, you can use an environment variable
for a single invocation of the nix tools.
$ export NIXPKGS_ALLOW_UNFREE=1
b) For nixos-rebuild
you can set
{ nixpkgs.config.allowUnfree = true; }
in configuration.nix to override this.
Alternatively you can configure a predicate to whitelist specific packages:
{ nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
“osu-lazer”
];
}
c) For nix-env
, nix-build
, nix-shell
or any other Nix command you can add
{ allowUnfree = true; }
to ~/.config/nixpkgs/config.nix.