quick3d/offlineshaders: Unknown CMake command "qt6_quick3d_build_shaders"

Skipping check for license update: Perpetual license.
Running /home/johanna/RTA/qt5/Tools/CMake/bin/cmake -S /home/johanna/RTA/qt5/Examples/Qt-6.0.0/quick3d/offlineshaders -B /tmp/QtCreator-TeKwgx/qtc-cmake-XHNwTWvC -GNinja -DCMAKE_BUILD_TYPE:String=Debug -DQT_QMAKE_EXECUTABLE:STRING=/home/johanna/RTA/qt5/6.0.0/gcc_64/bin/qmake -DCMAKE_PREFIX_PATH:STRING=/home/johanna/RTA/qt5/6.0.0/gcc_64 -DCMAKE_C_COMPILER:STRING=/usr/bin/gcc -DCMAKE_CXX_COMPILER:STRING=/usr/bin/g++ in /tmp/QtCreator-TeKwgx/qtc-cmake-XHNwTWvC.
-- The CXX compiler identification is GNU 7.5.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/g++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for C++ include pthread.h
-- Looking for C++ include pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - yes
-- Found Threads: TRUE  
-- Performing Test HAVE_STDATOMIC
-- Performing Test HAVE_STDATOMIC - Success
-- Found WrapAtomic: TRUE  
-- Found OpenGL: /usr/lib/x86_64-linux-gnu/libOpenGL.so   
-- Found WrapOpenGL: TRUE  
-- Could NOT find Vulkan (missing: Vulkan_LIBRARY Vulkan_INCLUDE_DIR) 
-- Found XKB: /usr/lib/x86_64-linux-gnu/libxkbcommon.so (found suitable version "0.8.2", minimum required is "0.5.0") 
-- Could NOT find Vulkan (missing: Vulkan_LIBRARY Vulkan_INCLUDE_DIR) 
CMake Warning (dev) at /home/johanna/RTA/qt5/6.0.0/gcc_64/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:467 (message):
  Please replace add_qt_gui_executable with qt_add_executable instead.  The
  former will be removed shortly.
Call Stack (most recent call first):
  CMakeLists.txt:23 (add_qt_gui_executable)
This warning is for project developers.  Use -Wno-dev to suppress it.CMake Error at CMakeLists.txt:59 (qt6_quick3d_build_shaders):
  Unknown CMake command "qt6_quick3d_build_shaders".
-- Configuring incomplete, errors occurred!