CMake: headersclean broken on dev

CMake Error at cmake/QtHeadersClean.cmake:249 (file):
  file RELATIVE_PATH must be passed a full path to the directory:
Call Stack (most recent call first):
  cmake/QtModuleHelpers.cmake:927 (qt_internal_add_headersclean_target)
  cmake/QtScopeFinalizerHelpers.cmake:24:EVAL:1 (qt_finalize_module)
  src/corelib/CMakeLists.txt:DEFERRED

    -GNinja \
    -DBUILD_TESTING=ON \
    -DBUILD_WITH_PCH=OFF \
    -DCMAKE_BUILD_TYPE=Custom \
    -DCMAKE_C_COMPILER=clang \
    -DCMAKE_C_COMPILER_LAUNCHER=ccache \
    -DCMAKE_C_FLAGS='-O3 -g0 -march=tigerlake -mprefer-vector-width=256 -maes' \
    -DCMAKE_CXX_COMPILER=clang++ \
    -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
    -DCMAKE_CXX_FLAGS='-O3 -g1 -march=tigerlake -mprefer-vector-width=256 -maes' \
    -DCMAKE_INSTALL_PREFIX=$PWD \
    -DCMAKE_SHARED_LINKER_FLAGS='-Wl,-O1 -Wl,--as-needed' \
    -DFEATURE_developer_build=ON \
    -DFEATURE_headersclean=ON \
    -DFEATURE_ipc_posix=ON \
    -DFEATURE_journald=ON \
    -DFEATURE_libproxy=ON \
    -DFEATURE_openssl_linked=ON \
    -DFEATURE_optimize_debug=OFF \
    -DFEATURE_reduce_relocations=ON \
    -DFEATURE_sctp=ON \
    -DFEATURE_system_sqlite=ON \
    -DQT_BUILD_TESTS_BY_DEFAULT=OFF \
    -DQT_LIBINFIX=.t \
    -DQT_QMAKE_TARGET_MKSPEC=linux-clang-optimised