/usr/include/x86_64-linux-gnu/ is in libqt5xmlpatterns5-dev 5.7.1~20161021-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/x86_64-linux-gnu/qt5/
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QAbstractMessageHandler
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QAbstractUriResolver
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QAbstractXmlNodeModel
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QAbstractXmlReceiver
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QSimpleXmlNodeModel
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QSourceLocation
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QXmlFormatter
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QXmlItem
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QXmlName
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QXmlNamePool
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QXmlNodeModelIndex
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QXmlQuery
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QXmlResultItems
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QXmlSchema
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QXmlSchemaValidator
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QXmlSerializer
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QtXmlPatterns
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QtXmlPatternsDepends
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/QtXmlPatternsVersion
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qabstractmessagehandler.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qabstracturiresolver.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qabstractxmlnodemodel.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qabstractxmlreceiver.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qsimplexmlnodemodel.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qsourcelocation.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qtxmlpatternsglobal.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qtxmlpatternsversion.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qxmlformatter.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qxmlname.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qxmlnamepool.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qxmlquery.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qxmlresultitems.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qxmlschema.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qxmlschemavalidator.h
/usr/include/x86_64-linux-gnu/qt5/QtXmlPatterns/qxmlserializer.h