new test_collecting_plugins failure in 6.6.3

264/510 Test #256: test_collecting_plugins ...............................***Failed 3.43 sec
Internal cmake changing into directory: /tmp/guix-build-qtbase-6.6.3.drv-0/build/tests/auto/cmake/test_collecting_plugins
Error: cmake execution failed
The C compiler identification is GNU 11.3.0
The CXX compiler identification is GNU 11.3.0
Detecting C compiler ABI info
Detecting C compiler ABI info - done
Check for working C compiler: /gnu/store/5lqhcv91ijy82p92ac6g5xw48l0lwwz4-gcc-11.3.0/bin/gcc - skipped
Detecting C compile features
Detecting C compile features - done
Detecting CXX compiler ABI info
Detecting CXX compiler ABI info - done
Check for working CXX compiler: /gnu/store/5lqhcv91ijy82p92ac6g5xw48l0lwwz4-gcc-11.3.0/bin/c++ - skipped
Detecting CXX compile features
Detecting CXX compile features - done
Performing Test CMAKE_HAVE_LIBC_PTHREAD
Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
Found Threads: TRUE 
Performing Test HAVE_STDATOMIC
Performing Test HAVE_STDATOMIC - Success
Found WrapAtomic: TRUE 
Promoting target to global: 'Qt6::syncqt'
Promoting target to global: 'Qt6::moc'
Promoting target to global: 'Qt6::rcc'
Promoting target to global: 'Qt6::tracepointgen'
Promoting target to global: 'Qt6::tracegen'
Promoting target to global: 'Qt6::cmake_automoc_parser'
Promoting target to global: 'Qt6::qlalr'
Promoting target to global: 'Qt6::qtpaths'
Promoting target to global: 'Qt6::androiddeployqt'
Promoting target to global: 'Qt6::androidtestrunner'
Promoting target to global: 'Qt6::qmake'
Found OpenGL: /gnu/store/438liya8d4wp2vmssab0hdq33j4iyqhc-mesa-23.3.2/lib/libGL.so 
Found WrapOpenGL: TRUE 
Found XKB: /gnu/store/3p2z3dw8kslb61mvl46q31jy61fc9sj1-libxkbcommon-1.5.0/lib/libxkbcommon.so (found suitable version "1.5.0", minimum required is "0.5.0") 
Found WrapVulkanHeaders: /gnu/store/5hq99ja8mfsnr5s573ywi866zlcpms9b-vulkan-headers-sdk-1.3.231.1/include 
Promoting target to global: 'Qt6::qvkgen'
Promoting target to global: 'Qt6::qdbuscpp2xml'
Promoting target to global: 'Qt6::qdbusxml2cpp'
CMake Warning at /tmp/guix-build-qtbase-6.6.3.drv-0/qtbase-everywhere-src-6.6.3/cmake/QtBuildHelpers.cmake:12 (message):
The officially supported CMake generator for building Qt is Ninja / Ninja
Multi-Config. You are using: 'Unix Makefiles' instead. Thus, you might
encounter issues. Use at your own risk.
Call Stack (most recent call first):
/tmp/guix-build-qtbase-6.6.3.drv-0/qtbase-everywhere-src-6.6.3/cmake/QtBuildHelpers.cmake:381 (qt_internal_validate_cmake_generator)
/tmp/guix-build-qtbase-6.6.3.drv-0/qtbase-everywhere-src-6.6.3/cmake/QtBuild.cmake:4 (qt_internal_setup_build_and_global_variables)
/tmp/guix-build-qtbase-6.6.3.drv-0/qtbase-everywhere-src-6.6.3/cmake/QtSetup.cmake:6 (include)
/tmp/guix-build-qtbase-6.6.3.drv-0/qtbase-everywhere-src-6.6.3/cmake/QtBuildRepoHelpers.cmake:21 (include)
/tmp/guix-build-qtbase-6.6.3.drv-0/qtbase-everywhere-src-6.6.3/cmake/QtBuildRepoHelpers.cmake:112 (qt_build_internals_set_up_private_api)
CMakeLists.txt:12 (qt_prepare_standalone_project)
CMake Error at /tmp/guix-build-qtbase-6.6.3.drv-0/qtbase-everywhere-src-6.6.3/cmake/QtMkspecHelpers.cmake:136 (message):
Unknown platform linux-g++
Known platforms:
modules
qconfig.pri
qmodule.pri
Call Stack (most recent call first):
/tmp/guix-build-qtbase-6.6.3.drv-0/qtbase-everywhere-src-6.6.3/cmake/QtBuildHelpers.cmake:433 (qt_internal_setup_platform_definitions_and_mkspec)
/tmp/guix-build-qtbase-6.6.3.drv-0/qtbase-everywhere-src-6.6.3/cmake/QtBuild.cmake:4 (qt_internal_setup_build_and_global_variables)
/tmp/guix-build-qtbase-6.6.3.drv-0/qtbase-everywhere-src-6.6.3/cmake/QtSetup.cmake:6 (include)
/tmp/guix-build-qtbase-6.6.3.drv-0/qtbase-everywhere-src-6.6.3/cmake/QtBuildRepoHelpers.cmake:21 (include)
/tmp/guix-build-qtbase-6.6.3.drv-0/qtbase-everywhere-src-6.6.3/cmake/QtBuildRepoHelpers.cmake:112 (qt_build_internals_set_up_private_api)
CMakeLists.txt:12 (qt_prepare_standalone_project)
Configuring incomplete, errors occurred!
See also "/tmp/guix-build-qtbase-6.6.3.drv-0/build/tests/auto/cmake/test_collecting_plugins/CMakeFiles/CMakeOutput.log".