cmake _unique_prefix examples

qt/qtbase cmake/QtFindWrapHelper.cmake :76

find_package("${${_unique_prefix}_qt_package_name_to_use}"
                PATHS
                    ${QT_BUILD_CMAKE_PREFIX_PATH}
                    "${CMAKE_CURRENT_LIST_DIR}/.."
                    ${_qt_cmake_dir}
                    ${_qt_additional_packages_prefix_paths}
                ${${_unique_prefix}_qt_use_no_default_path_for_qt_packages}
            )