update

user/programs/steam/default.nix

@@ -0,0 +1,19 @@
+{ config, pkgs, ... }:
+
+{
+  home.packages = [
+    pkgs.steam-run,
+  ];
+
+  programs.steam = {
+    enable = true;
+    remotePlay.openFirewall = true; # Open ports in the firewall for Steam Remote Play
+    dedicatedServer.openFirewall = true; # Open ports in the firewall for Source Dedicated Server
+  };
+
+  nixpkgs = {
+    overlays = [
+      (import ./overlays/steam.nix)
+    ];
+  };
+}

user/programs/steam/overlays/steam.nix

@@ -0,0 +1,19 @@
+self: super:
+{
+  steam = super.steam.override {
+    extraPkgs = p: [
+      self.gtk3 
+      self.atk 
+      self.at-spi2-atk 
+      self.zlib 
+      self.glib
+      self.fontconfig
+      self.freetype
+      self.dbus
+      self.cairo
+      self.gdk-pixbuf
+      self.pango
+      self.xorg.libxcb
+    ];
+  };
+}