[nostalgia] Make portable between Qt5 and Qt6

src/nostalgia/studio/CMakeLists.txt

@@ -53,7 +53,7 @@ add_executable(
 target_link_libraries(
 	NostalgiaStudioJsonTest
 		OxStd
-		Qt6::Widgets
+		Qt${QT_VERSION_MAJOR}::Widgets
 )
 
 add_test("[nostalgia/studio] NostalgiaStudioJson" NostalgiaStudioJsonTest)

src/nostalgia/studio/lib/CMakeLists.txt

@@ -17,7 +17,7 @@ target_include_directories(NostalgiaStudio PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
 
 target_link_libraries(
 	NostalgiaStudio PUBLIC
-		Qt6::Widgets
+		Qt${QT_VERSION_MAJOR}::Widgets
 		OxFS
 		OxClaw
 )

src/nostalgia/studio/main.cpp

@@ -27,7 +27,9 @@ int main(int argc, char **args) {
 		qdark::load(&app);
 	}
 	// force QtQuick to use OpenGL (https://doc.qt.io/qt-6/quick-changes-qt6.html#changes-to-qquickwidget)
+#if QT_VERSION >= 0x060000
 	QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGLRhi);
+#endif
 	// open window
 	try {
 		MainWindow w(argProfilePath);