flake.nix

+{
+  description = "ReqMan is a tool for managing requirements and test cases.";
+
+  # Nixpkgs / NixOS version to use.
+  inputs.nixpkgs.url = "nixpkgs/nixos-23.11";
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    # to work with older version of flakes
+    lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
+
+    rootPath = ./.;
+
+    goPkgReleaseData = import "${rootPath}/project.nix";
+
+    goPkgName = goPkgReleaseData.name or "goPkg";
+    goPkgMnemonic = goPkgReleaseData.mnemonic or "go-pkg";
+    goPkgDescription = goPkgReleaseData.description or "this is a goPkg";
+    goPkgVersion = goPkgReleaseData.version or "0.1.0";
+    goPkgHash =
+      if (self ? shortRev)
+      then self.shortRev
+      else "dirty-not-for-production";
+    goPkgVendorHash = goPkgReleaseData.vendorHash or null;
+
+    # System types to support.
+    supportedSystems = ["x86_64-linux" "x86_64-windows" "x86_64-darwin"];
+
+    # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+    forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+    # Nixpkgs instantiated for supported system types.
+    nixpkgsFor = forAllSystems (system: import nixpkgs {inherit system;});
+  in {
+    packages = forAllSystems (system: let
+      pkgs = nixpkgsFor.${system};
+    in {
+      reqman = pkgs.buildGoModule {
+        name = goPkgName;
+
+        # In 'nix develop', we don't need a copy of the source tree
+        # in the Nix store.
+        src = ././source;
+        tags = []; # add your tags here (eq  "netgo" "osusergo" "static_build")
+
+        ldflags = [
+          "-X 'main.version=${goPkgVersion}'"
+          "-X 'main.commit=${goPkgHash}'"
+          "-X 'main.build=${lastModifiedDate}'"
+          "-X 'main.name=${goPkgName}'"
+          "-X 'main.mnemonic=${goPkgMnemonic}'"
+        ];
+
+        #vendorHash = pkgs.lib.fakeHash;
+        vendorHash = goPkgVendorHash;
+
+        meta = with nixpkgs.legacyPackages.${system}.lib; {
+          description = goPkgDescription;
+          homepage = "https://gitlab.schukai.com/oss/utilities/requirements-manager";
+          license = licenses.mit;
+          maintainers = with maintainers; ["schukai GmbH"];
+        };
+      };
+
+      default = self.packages.${system}.reqman;
+    });
+
+    # Add dependencies that are only needed for development
+    devShells = forAllSystems (system: let
+      pkgs = nixpkgsFor.${system};
+    in {
+      default = pkgs.mkShell {
+        buildInputs = with pkgs; [go gopls gotools go-tools];
+      };
+    });
+
+    # The default package for 'nix build'. This makes sense if the
+    # flake provides only one package or there is a clear "main"
+    # package.
+    defaultPackage = forAllSystems (system: self.packages.${system}.reqman);
+  };
+}