Add nix compat using nix-ld

hosts/common/optional/fhs-compat.nix

@@ -0,0 +1,69 @@
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}: {
+  services.envfs.enable = lib.mkDefault true;
+
+  programs.nix-ld.enable = lib.mkDefault true;
+  programs.nix-ld.libraries = with pkgs;
+    [
+      acl
+      attr
+      bzip2
+      dbus
+      expat
+      fontconfig
+      freetype
+      fuse3
+      icu
+      libnotify
+      libsodium
+      libssh
+      libunwind
+      libusb1
+      libuuid
+      nspr
+      nss
+      stdenv.cc.cc
+      util-linux
+      zlib
+      zstd
+    ]
+    ++ lib.optionals (config.hardware.graphics.enable) [
+      pipewire
+      cups
+      libxkbcommon
+      pango
+      mesa
+      libdrm
+      libglvnd
+      libpulseaudio
+      atk
+      cairo
+      alsa-lib
+      at-spi2-atk
+      at-spi2-core
+      gdk-pixbuf
+      glib
+      gtk3
+      libGL
+      libappindicator-gtk3
+      vulkan-loader
+      xorg.libX11
+      xorg.libXScrnSaver
+      xorg.libXcomposite
+      xorg.libXcursor
+      xorg.libXdamage
+      xorg.libXext
+      xorg.libXfixes
+      xorg.libXi
+      xorg.libXrandr
+      xorg.libXrender
+      xorg.libXtst
+      xorg.libxcb
+      xorg.libxkbfile
+      xorg.libxshmfence
+    ];
+}

hosts/ludwig/default.nix

@@ -34,6 +34,7 @@
     ../common/optional/desktop/japanese.nix
     ../common/optional/udisks.nix
     ../common/optional/tailscale.nix
+    ../common/optional/fhs-compat.nix
   ];
 
   nixpkgs = {
@@ -64,6 +65,7 @@
   };
 
   networking.hostName = "ludwig";
+  systemd.services.NetworkManager-wait-online.enable = false;
 
   services.udev.packages = [pkgs.segger-jlink];