/usr/lib/ is in libdtkcore-dev 2.0.7.1-3.
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/Dtk/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/
/usr/lib/x86_64-linux-gnu/cmake/Dtk/DtkConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/DtkCore/
/usr/lib/x86_64-linux-gnu/cmake/DtkCore/DtkCoreConfig.cmake
/usr/lib/x86_64-linux-gnu/libdtk/
/usr/lib/x86_64-linux-gnu/libdtk/modules/
/usr/lib/x86_64-linux-gnu/libdtk/modules/version.pri
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/dtkcore.pc
/usr/lib/x86_64-linux-gnu/qt5/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/dtk_build.prf
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/dtk_cmake.prf
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/dtk_module.prf
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_dtkcore.pri
/usr/lib/x86_64-linux-gnu/libdtkcore.so