Default to Qt5 when no QT_MAJOR_VERSION set

Author: JamiKettunen

CMakeLists.txt

@@ -19,6 +19,10 @@ include(AsteroidCMakeSettings)
 
 set(ASTEROID_MODULES_INSTALL_DIR ${CMAKE_INSTALL_DATADIR}/asteroidapp/cmake)
 
+# TODO: wasn't there a better way especially with 5.15/6 like find_package(Qt COMPONENTS Core REQUIRED)
+if (NOT DEFINED QT_MAJOR_VERSION)
+    set(QT_MAJOR_VERSION 5)
+endif()
 find_package(Qt${QT_MAJOR_VERSION} ${QT_MIN_VERSION} COMPONENTS DBus Qml Quick Svg REQUIRED)
 if (WITH_ASTEROIDAPP)
     find_package(Mlite${QT_MAJOR_VERSION} MODULE REQUIRED)