/usr/include/ is in liboxideqtcore-dev 1.13.6-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/x86_64-linux-gnu/
/usr/include/x86_64-linux-gnu/oxide-qt/
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqwebpreferences.h
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqsslcertificate.h
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqmediacapturedevices.h
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqnavigationrequest.h
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqglobal.h
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqfindcontroller.h
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqdownloadrequest.h
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqloadevent.h
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqcertificateerror.h
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqnewviewrequest.h
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqsecuritystatus.h
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqpermissionrequest.h
/usr/include/x86_64-linux-gnu/oxide-qt/OxideQtCore/oxideqhttpauthenticationrequest.h