/usr/lib/x86_64-linux-gnu/ is in libpolkit-qt-1-dev 0.112.0-4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/PolkitQt-1/
/usr/lib/x86_64-linux-gnu/cmake/PolkitQt-1/PolkitQt-1Targets.cmake
/usr/lib/x86_64-linux-gnu/cmake/PolkitQt-1/PolkitQt-1Config.cmake
/usr/lib/x86_64-linux-gnu/cmake/PolkitQt-1/PolkitQt-1Targets-debian.cmake
/usr/lib/x86_64-linux-gnu/cmake/PolkitQt-1/PolkitQt-1ConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/polkit-qt-core-1.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/polkit-qt-1.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/polkit-qt-agent-1.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/polkit-qt-gui-1.pc
/usr/lib/x86_64-linux-gnu/libpolkit-qt-agent-1.so
/usr/lib/x86_64-linux-gnu/libpolkit-qt-core-1.so
/usr/lib/x86_64-linux-gnu/libpolkit-qt-gui-1.so