I am trying to install Steam. I have read the Unfree Software wiki page and followed the Steam nixos wiki about how to install it, but it gives the error undefined variable 'lib'. I have seen other similar posts but all of them seem to be about troubles with flakes (which I don’t use).
Full terminal output
[francesccs@nixos:/etc/nixos]$ sudo nixos-rebuild switch
error:
… while evaluating the attribute 'config'
at /nix/store/16p5yr3m9p0y7ain2gin15rnnbbh0nyp-nixos-26.05/nixos/lib/modules.nix:402:9:
401| options = checked options;
402| config = checked (removeAttrs config [ "_module" ]);
| ^
403| _module = checked (config._module);
… while calling the 'seq' builtin
at /nix/store/16p5yr3m9p0y7ain2gin15rnnbbh0nyp-nixos-26.05/nixos/lib/modules.nix:402:18:
401| options = checked options;
402| config = checked (removeAttrs config [ "_module" ]);
| ^
403| _module = checked (config._module);
(stack trace truncated; use '--show-trace' to show the full, detailed trace)
error: undefined variable 'lib'
at /etc/nixos/configuration.nix:18:20:
17| nixpkgs.config.allowUnfreePredicate = pkg:
18| builtins.elem (lib.getName pkg) [
| ^
19| "steam"
Command 'nix-build '<nixpkgs/nixos>' --attr config.system.build.nixos-rebuild --no-out-link' returned non-zero exit status 1.
configuration.nix
# Edit this configuration file to define what should be installed on
# your system. Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).
{ config, pkgs, ... }:
{
imports =
[ # Include the results of the hardware scan.
./hardware-configuration.nix
];
nixpkgs.config.allowUnfreePredicate = pkg:
builtins.elem (lib.getName pkg) [
"steam"
"steam-unwrapped"
];
# Bootloader.
boot.loader.systemd-boot.enable = true;
boot.loader.efi.canTouchEfiVariables = true;
boot.kernelParams = ["amdgpu.sg_display=0"];
networking.hostName = "nixos"; # Define your hostname.
# networking.wireless.enable = true; # Enables wireless support via wpa_supplicant.
# Configure network proxy if necessary
# networking.proxy.default = "http://user:password@proxy:port/";
# networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";
#nixpkgs.config.allowUnfree = true;
# Enable networking
networking.networkmanager.enable = true;
networking.firewall = {
allowedTCPPorts = [80 433 ];
};
# Set your time zone.
time.timeZone = "Europe/Madrid";
# Select internationalisation properties.
i18n.defaultLocale = "en_US.UTF-8";
i18n.extraLocaleSettings = {
LC_ADDRESS = "es_ES.UTF-8";
LC_IDENTIFICATION = "es_ES.UTF-8";
LC_MEASUREMENT = "es_ES.UTF-8";
LC_MONETARY = "es_ES.UTF-8";
LC_NAME = "es_ES.UTF-8";
LC_NUMERIC = "es_ES.UTF-8";
LC_PAPER = "es_ES.UTF-8";
LC_TELEPHONE = "es_ES.UTF-8";
LC_TIME = "es_ES.UTF-8";
};
# Enable the X11 windowing system.
# You can disable this if you're only using the Wayland session.
services.xserver.enable = true;
# Enable the KDE Plasma Desktop Environment.
services.displayManager.sddm.enable = true;
services.desktopManager.plasma6.enable = true;
# Configure keymap in X11
services.xserver.xkb = {
layout = "es";
variant = "";
};
# Configure console keymap
console.keyMap = "es";
# Enable CUPS to print documents.
services.printing.enable = true;
#services.printing.drivers = [
#pkgs.brgenml1cupswrapper
#pkgs.brgenml1lpr
#];
# Enable sound with pipewire.
services.pulseaudio.enable = false;
security.rtkit.enable = true;
services.pipewire = {
enable = true;
alsa.enable = true;
alsa.support32Bit = true;
pulse.enable = true;
# If you want to use JACK applications, uncomment this
#jack.enable = true;
# use the example session manager (no others are packaged yet so this is enabled by default,
# no need to redefine it in your config for now)
#media-session.enable = true;
};
# Enable touchpad support (enabled default in most desktopManager).
# services.xserver.libinput.enable = true;
# Define a user account. Don't forget to set a password with ‘passwd’.
users.users.francesccs = {
isNormalUser = true;
description = "Hidden for privacy purposes";
extraGroups = [ "networkmanager" "wheel" ];
packages = with pkgs; [
kdePackages.kate
kdePackages.kmail
kdePackages.konqueror
kdePackages.filelight
kdePackages.ktorrent
kdePackages.kruler
#kdePackages.kamoso
thunderbird
];
};
hardware.bluetooth.enable = true;
# Install firefox.
programs.firefox.enable = true;
programs.kdeconnect.enable = true;
programs.steam.enable = true;
# List packages installed in system profile. To search, run:
# $ nix search wget
nixpkgs.config.permittedInsecurePackages = [
"electron-39.8.10"
];
environment.systemPackages = with pkgs; [
# vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
# wget
brave
tor-browser
yt-dlp
lynx
vscodium
git
lapce
zed-editor
neovim
netbeans
#nodePackages.nodejs
rustup
gcc
typescript
python314
openjdk
mysql84
mysql-workbench
dbeaver-bin
libreoffice-qt
dia
hunspell
hunspellDicts.es_ES
texliveFull
texstudio
texlivePackages.fontspec
octaveFull
kdePackages.kdenlive
audacity
fastfetch
htop
btop
fzf
ripgrep
# zoxide
uget
croc
linuxquota
taskwarrior3
# framework-tool-tui
yazi
ranger
zapzap
mumble
dino
signal-desktop
logseq
nextcloud-client
#appflowy unfree
digikam
qownnotes
joplin-desktop
vlc
inkscape
gimp
imagemagick
blender
godot
ani-cli
freetube
peertube
mpd
rmpc
cava
gnupg
pinentry-qt
paprefs
qpwgraph
pavucontrol
digital
freecad
openscad
kicad
luanti
mindustry-wayland
prismlauncher
colobot
the-powder-toy
#lincity-ng
kvmtool
iptables
gparted
lm_sensors
nmap
distrobox
cmatrix
cbonsai
sl
];
# Some programs need SUID wrappers, can be configured further or are
# started in user sessions.
# programs.mtr.enable = true;
# programs.gnupg.agent = {
# enable = true;
# enableSSHSupport = true;
# };
# List services that you want to enable:
# Enable the OpenSSH daemon.
# services.openssh.enable = true;
# Open ports in the firewall.
# networking.firewall.allowedTCPPorts = [ ... ];
# networking.firewall.allowedUDPPorts = [ ... ];
# Or disable the firewall altogether.
# networking.firewall.enable = false;
# This value determines the NixOS release from which the default
# settings for stateful data, like file locations and database versions
# on your system were taken. It‘s perfectly fine and recommended to leave
# this value at the release version of the first install of this system.
# Before changing this value read the documentation for this option
# (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
system.stateVersion = "25.05"; # Did you read the comment?
}
I have tried changing lib for nigpkgs but that gives another error.
Idk if it’s something super obvious that I’m missing but I would really appreciate the help.