/usr/lib/ is in libpolkit-qt5-1-dev 0.112.0-4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/PolkitQt5-1/
/usr/lib/x86_64-linux-gnu/cmake/PolkitQt5-1/PolkitQt5-1ConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/PolkitQt5-1/PolkitQt5-1Config.cmake
/usr/lib/x86_64-linux-gnu/cmake/PolkitQt5-1/PolkitQt5-1Targets.cmake
/usr/lib/x86_64-linux-gnu/cmake/PolkitQt5-1/PolkitQt5-1Targets-debian.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/polkit-qt5-core-1.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/polkit-qt5-gui-1.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/polkit-qt5-agent-1.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/polkit-qt5-1.pc
/usr/lib/x86_64-linux-gnu/libpolkit-qt5-agent-1.so
/usr/lib/x86_64-linux-gnu/libpolkit-qt5-core-1.so
/usr/lib/x86_64-linux-gnu/libpolkit-qt5-gui-1.so