trying to get nix develop to work

CMakeLists.txt

@@ -13,7 +13,7 @@ set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
 find_package(ECM ${KF5_MIN_VERSION} REQUIRED NO_MODULE)
 
-set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${ECM_MODULE_PATH})
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${ECM_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 
 include(KDEInstallDirs)
 include(KDECMakeSettings)
@@ -27,6 +27,10 @@ kde_enable_exceptions()
 find_package(Qt5 ${QT_MIN_VERSION} REQUIRED NO_MODULE COMPONENTS Core Quick Test Gui QuickControls2 Widgets Sql X11Extras)
 find_package(KF5 ${KF_MIN_VERSION} REQUIRED COMPONENTS Kirigami2 I18n CoreAddons)
 
+find_package(Libmpv)
+set_package_properties(Libmpv PROPERTIES TYPE REQUIRED)
+
+
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 

flake.nix

@@ -0,0 +1,14 @@
+{
+  description = "A Church Presentation Application";
+
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem
+      (system:
+        let pkgs = nixpkgs.legacyPackages.${system}; in
+        {
+          devShell = import ./shell.nix { inherit pkgs; };
+        }
+      );
+}

shell.nix

@@ -0,0 +1,33 @@
+with import <nixpkgs> { };
+pkgs.mkShell {
+  name = "presenter-env";
+
+  nativeBuildInputs = [
+    gcc
+    gnumake
+    clang
+    cmake
+    extra-cmake-modules
+    pkg-config
+    # gccStdenv
+    # stdenv
+  ];
+
+  buildInputs = [
+    qt5.qtbase
+    qt5.qttools
+    qt5.qtquickcontrols2
+    qt5.qtx11extras
+    qt5.qtmultimedia
+    libsForQt5.kirigami2
+    libsForQt5.ki18n
+    libsForQt5.kcoreaddons
+    mpv
+    # libsForQt5.kconfig
+    # ffmpeg-full
+    # yt-dlp
+  ];
+
+  shellHook = ''
+  '';
+}

src/qml/main.qml

@@ -5,7 +5,7 @@ import Qt.labs.platform 1.1 as Labs
 import QtQuick.Window 2.13
 import QtQuick.Layouts 1.2
 import QtMultimedia 5.15
-import QtAudioEngine 1.15
+/* import QtAudioEngine 1.15 */
 import org.kde.kirigami 2.13 as Kirigami
 import "./presenter" as Presenter
 

src/qml/presenter/Actions.qml

@@ -4,7 +4,7 @@ import QtQuick.Controls 2.15 as Controls
 import QtQuick.Window 2.13
 import QtQuick.Layouts 1.2
 import QtMultimedia 5.15
-import QtAudioEngine 1.15
+/* import QtAudioEngine 1.15 */
 import org.kde.kirigami 2.13 as Kirigami
 import "./" as Presenter
 

src/qml/presenter/LeftDock.qml

@@ -5,7 +5,7 @@ import QtQuick.Window 2.13
 import QtQuick.Layouts 1.2
 import QtQml.Models 2.12
 import QtMultimedia 5.15
-import QtAudioEngine 1.15
+/* import QtAudioEngine 1.15 */
 import org.kde.kirigami 2.13 as Kirigami
 import "./" as Presenter
 

src/qml/presenter/Presentation.qml

@@ -3,7 +3,7 @@ import QtQuick.Dialogs 1.0
 import QtQuick.Controls 2.15 as Controls
 import QtQuick.Window 2.13
 import QtQuick.Layouts 1.2
-import QtAudioEngine 1.15
+/* import QtAudioEngine 1.15 */
 import org.kde.kirigami 2.13 as Kirigami
 import "./" as Presenter
 

src/qml/presenter/Slide.qml

@@ -2,7 +2,7 @@ import QtQuick 2.13
 import QtQuick.Controls 2.15 as Controls
 import QtQuick.Layouts 1.2
 /* import QtMultimedia 5.15 */
-import QtAudioEngine 1.15
+/* import QtAudioEngine 1.15 */
 import QtGraphicalEffects 1.15
 import org.kde.kirigami 2.13 as Kirigami
 import "./" as Presenter

src/qml/presenter/SlideEditor.qml

@@ -4,7 +4,7 @@ import QtQuick.Controls 2.15 as Controls
 import QtQuick.Window 2.13
 import QtQuick.Layouts 1.2
 import QtMultimedia 5.15
-import QtAudioEngine 1.15
+/* import QtAudioEngine 1.15 */
 import org.kde.kirigami 2.13 as Kirigami
 import "./" as Presenter