/usr/lib/x86_64-linux-gnu/ is in qtdeclarative5-dev 5.5.1-2ubuntu6.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/libQt5QmlDevTools.a
/usr/lib/x86_64-linux-gnu/libQt5QmlDevTools.prl
/usr/lib/x86_64-linux-gnu/libQt5Qml.prl
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5QuickParticles.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5QuickTest.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5QmlDevTools.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Qml.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5QuickWidgets.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Quick.pc
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/Qt5Quick/
/usr/lib/x86_64-linux-gnu/cmake/Qt5Quick/Qt5QuickConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Quick/Qt5QuickConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5QuickTest/
/usr/lib/x86_64-linux-gnu/cmake/Qt5QuickTest/Qt5QuickTestConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5QuickTest/Qt5QuickTestConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Qml/
/usr/lib/x86_64-linux-gnu/cmake/Qt5Qml/Qt5QmlConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Qml/Qt5Qml_QTcpServerConnection.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Qml/Qt5QmlConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5QuickWidgets/
/usr/lib/x86_64-linux-gnu/cmake/Qt5QuickWidgets/Qt5QuickWidgetsConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5QuickWidgets/Qt5QuickWidgetsConfig.cmake
/usr/lib/x86_64-linux-gnu/libQt5QuickParticles.prl
/usr/lib/x86_64-linux-gnu/libQt5QuickWidgets.prl
/usr/lib/x86_64-linux-gnu/qt5/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_qml.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_quick.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_quickwidgets.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_qmltest.pri
/usr/lib/x86_64-linux-gnu/libQt5QuickTest.prl
/usr/lib/x86_64-linux-gnu/libQt5Quick.prl
/usr/lib/x86_64-linux-gnu/libQt5QuickParticles.so
/usr/lib/x86_64-linux-gnu/libQt5Qml.so
/usr/lib/x86_64-linux-gnu/libQt5Quick.so
/usr/lib/x86_64-linux-gnu/libQt5QuickWidgets.so
/usr/lib/x86_64-linux-gnu/libQt5QuickTest.so