/usr/lib/ is in libqca-qt5-2-dev 2.1.1-4+b2.
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/Qca-qt5/
/usr/lib/x86_64-linux-gnu/cmake/Qca-qt5/Qca-qt5Config.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qca-qt5/Qca-qt5ConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qca-qt5/Qca-qt5Targets-debian.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qca-qt5/Qca-qt5Targets.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/qca2-qt5.pc
/usr/lib/x86_64-linux-gnu/qt5/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/crypto.prf
/usr/lib/x86_64-linux-gnu/libqca-qt5.so