First working version

.gitignore

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+result

flake.lock

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+{
+  "nodes": {
+    "gpt4all-chat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1683465609,
+        "narHash": "sha256-+FnySE2i92rDOndoyCeb1IVpyqQSIn4srlwXgZJWbd8=",
+        "ref": "refs/heads/master",
+        "rev": "9bd5609ba0fd19e8445a2ae816c494e7a01baaa1",
+        "revCount": 321,
+        "submodules": true,
+        "type": "git",
+        "url": "https://github.com/nomic-ai/gpt4all-chat"
+      },
+      "original": {
+        "submodules": true,
+        "type": "git",
+        "url": "https://github.com/nomic-ai/gpt4all-chat"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1683408522,
+        "narHash": "sha256-9kcPh6Uxo17a3kK3XCHhcWiV1Yu1kYj22RHiymUhMkU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "897876e4c484f1e8f92009fd11b7d988a121a4e7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "gpt4all-chat": "gpt4all-chat",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "A very basic flake";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  inputs.gpt4all-chat = {
+    url = "https://github.com/nomic-ai/gpt4all-chat";
+    flake = false;
+    submodules = true;
+    type = "git";
+  };
+
+  outputs = { self, nixpkgs, gpt4all-chat }:
+  let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+  in
+  {
+    packages.${system} = {
+      gpt4all-chat = pkgs.qt6Packages.callPackage ./gpt4all-chat.nix { src=gpt4all-chat; };
+      default = self.packages.${system}.gpt4all-chat;
+    };
+  };
+}

gpt4all-chat.nix

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+{ src 
+, lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, qmake
+, qtquicktimeline
+, qtsvg
+, wrapQtAppsHook
+}:
+
+stdenv.mkDerivation {
+  pname = "gpt4all-chat";
+  version = "nightly";
+
+  inherit src;
+
+  postPatch = ''
+    substituteInPlace CMakeLists.txt \
+      --replace 'set(CMAKE_INSTALL_PREFIX ''${CMAKE_BINARY_DIR}/install)' ""
+  '';
+
+  nativeBuildInputs = [
+    wrapQtAppsHook
+    cmake
+    qmake
+  ];
+
+  buildInputs = [
+    qtquicktimeline
+    qtsvg
+  ];
+
+
+  meta = with lib; {
+    description = "Gpt4all-j chat";
+    homepage = "https://github.com/nomic-ai/gpt4all-chat";
+    license = licenses.mit;
+    maintainers = with maintainers; [ ];
+  };
+}