#3061 nix: try to add build system for older Qt5 versions

build-systems/nix/default-qt5.nix

@@ -0,0 +1,81 @@
+{ lib
+, stdenv
+, fetchurl
+, qmake
+, qttools
+, qtbase
+, qtdeclarative
+, qtsvg
+, qtwayland
+, qtwebsockets
+, qt5compat
+, makeWrapper
+, wrapQtAppsHook
+, botan2
+, pkg-config
+, xvfb-run
+, installShellFiles
+}:
+
+let
+  pname = "qownnotes";
+  appname = "QOwnNotes";
+#  version = builtins.head (builtins.match "#define VERSION \"([0-9.]+)\"" (builtins.readFile ./src/version.h));
+  version = "local-build";
+in
+stdenv.mkDerivation {
+  inherit pname appname version;
+
+  src = builtins.path { path = ./src; name = "qownnotes"; };
+
+  nativeBuildInputs = [
+    qmake
+    qttools
+    wrapQtAppsHook
+    pkg-config
+    installShellFiles
+    xvfb-run
+  ] ++ lib.optionals stdenv.isDarwin [ makeWrapper ];
+
+  buildInputs = [
+    qtbase
+    qtdeclarative
+    qtsvg
+    qtwebsockets
+    qt5compat
+    botan2
+  ] ++ lib.optionals stdenv.isLinux [ qtwayland ];
+
+  qmakeFlags = [
+    "USE_SYSTEM_BOTAN=1"
+  ];
+
+  postInstall = ''
+    installShellCompletion --cmd ${appname} \
+      --bash <(xvfb-run $out/bin/${appname} --completion bash) \
+      --fish <(xvfb-run $out/bin/${appname} --completion fish)
+    installShellCompletion --cmd ${pname} \
+      --bash <(xvfb-run $out/bin/${appname} --completion bash) \
+      --fish <(xvfb-run $out/bin/${appname} --completion fish)
+  ''
+  # Create a lowercase symlink for Linux
+  + lib.optionalString stdenv.isLinux ''
+    ln -s $out/bin/${appname} $out/bin/${pname}
+  ''
+  # Wrap application for macOS as lowercase binary
+  + lib.optionalString stdenv.isDarwin ''
+    mkdir -p $out/Applications
+    mv $out/bin/${appname}.app $out/Applications
+    makeWrapper $out/Applications/${appname}.app/Contents/MacOS/${appname} $out/bin/${pname}
+  '';
+
+  meta = with lib; {
+    description = "Plain-text file notepad and todo-list manager with Markdown support and Nextcloud/ownCloud integration";
+    homepage = "https://www.qownnotes.org/";
+    changelog = "https://www.qownnotes.org/changelog.html";
+    downloadPage = "https://github.com/pbek/QOwnNotes/releases/tag/v${version}";
+    license = licenses.gpl2Only;
+    maintainers = with maintainers; [ pbek totoroot ];
+    platforms = platforms.unix;
+  };
+}

flake.nix

@@ -3,9 +3,23 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    nixpkgs-qt515.url = "github:nixos/nixpkgs/72bbea9db7d727ed044e60b5f5febc60a3c5c955";
+    systems.url = "github:nix-systems/default";
   };
 
-  outputs = { self, nixpkgs }: {
+  outputs = {
+    self,
+    nixpkgs,
+    nixpkgs-qt515,
+#    systems,
+  }: let
+    systems = [ "x86_64-linux" ];
+    eachSystem = nixpkgs.lib.genAttrs (import systems);
+  in {
+    packages = eachSystem (system: {
+      qownnotes-qt5 = nixpkgs.${system}.legacyPackages.libsForQt5.callPackage (import ./build-systems/nix/default-qt5.nix) { };
+      qownnotes-qt515 = nixpkgs-qt515.${system}.legacyPackages.libsForQt5.callPackage (import ./build-systems/nix/default-qt5.nix) { };
+    });
 
     devShell.x86_64-linux =
     with import nixpkgs {