[FTBFS] gtgrpc: CMake Error: AUTOMOC for target protocplugintestcommon: The "moc" executable "xxxx" does not exist.

    -GNinja \
    -DBUILD_TESTING=ON \
    -DBUILD_WITH_PCH=OFF \
    -DBUILD_qtwebengine=OFF \
    -DBUILD_qtwebview=OFF \
    -DCMAKE_BUILD_TYPE=Custom \
    -DCMAKE_CXX_COMPILER=`which g++` \
    -DCMAKE_CXX_FLAGS='-O3 -march=skylake-avx512 -mprefer-vector-width=256 -maes -fdiagnostics-color=always' \
    -DCMAKE_CXX_STANDARD=20 \
    -DCMAKE_C_COMPILER=`which gcc` \
    -DCMAKE_C_FLAGS='-O3 -march=skylake-avx512 -mprefer-vector-width=256 -maes -fdiagnostics-color=always' \
    -DCMAKE_EXE_LINKER_FLAGS='-flto=auto' \
    -DCMAKE_INSTALL_PREFIX=$HOME/obj/qt/installed \
    -DCMAKE_MODULE_LINKER_FLAGS='-Wl,-O1 -Wl,--as-needed -flto=auto' \
    -DCMAKE_SHARED_LINKER_FLAGS='-Wl,-O1 -Wl,--as-needed -flto=auto' \
    -DFEATURE_dbus_linked=OFF \
    -DFEATURE_developer_build=ON \
    -DFEATURE_journald=ON \
    -DFEATURE_libproxy=ON \
    -DFEATURE_mimetype_database=OFF \
    -DFEATURE_no_direct_extern_access=ON \
    -DFEATURE_openssl_linked=ON \
    -DFEATURE_optimize_debug=OFF \
    -DFEATURE_qt3d_simd_avx2=ON \
    -DFEATURE_reduce_relocations=ON \
    -DFEATURE_sctp=ON \
    -DFEATURE_system_sqlite=ON \
    -DFEATURE_system_xcb_xinput=ON \
    -DFEATURE_xcb=ON \
    -DINSTALL_ARCHDATADIR=lib64/qt6 \
    -DINSTALL_DATADIR=share/qt6 \
    -DINSTALL_LIBDIR=lib64 \
    -DINSTALL_LIBEXECDIR=libexec \
    -DINSTALL_MKSPECSDIR=lib64/qt6/mkspecs \
    -DINSTALL_SYSCONFDIR=/etc/xdg \
    -DQT_BUILD_EXAMPLES_BY_DEFAULT=OFF \
    -DQT_BUILD_TESTS_BY_DEFAULT=OFF \
    -DQT_LIBINFIX=.t \
    -DQT_SYNC_HEADERS_AT_CONFIGURE_TIME=OFF \
    -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON \

-- Configuring done (92.5s)
CMake Error: AUTOMOC for target protocplugintestcommon: The "moc" executable "/home/tjmaciei/obj/qt/qt6-release/qtbase/libexec/moc" does not exist.
CMake Generate step failed.  Build files cannot be regenerated correctly.