/usr/lib/x86_64-linux-gnu/ is in qttools5-dev 5.7.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/qt5/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/Qt5Designer/
/usr/lib/x86_64-linux-gnu/cmake/Qt5Designer/Qt5DesignerConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Designer/Qt5DesignerConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Help/
/usr/lib/x86_64-linux-gnu/cmake/Qt5Help/Qt5HelpConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Help/Qt5HelpConfigExtras.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Help/Qt5HelpConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5UiPlugin/
/usr/lib/x86_64-linux-gnu/cmake/Qt5UiPlugin/Qt5UiPluginConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5UiPlugin/Qt5UiPluginConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5UiTools/
/usr/lib/x86_64-linux-gnu/cmake/Qt5UiTools/Qt5UiToolsConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5UiTools/Qt5UiToolsConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/libQt5CLucene.prl
/usr/lib/x86_64-linux-gnu/libQt5Designer.prl
/usr/lib/x86_64-linux-gnu/libQt5DesignerComponents.prl
/usr/lib/x86_64-linux-gnu/libQt5Help.prl
/usr/lib/x86_64-linux-gnu/libQt5UiTools.a
/usr/lib/x86_64-linux-gnu/libQt5UiTools.prl
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Designer.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Help.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5UiTools.pc
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_designer.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_help.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_uiplugin.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_uitools.pri
/usr/lib/x86_64-linux-gnu/libQt5CLucene.so
/usr/lib/x86_64-linux-gnu/libQt5Designer.so
/usr/lib/x86_64-linux-gnu/libQt5DesignerComponents.so
/usr/lib/x86_64-linux-gnu/libQt5Help.so