/usr/include/ is in modemmanager-qt-dev 5.44.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/
/usr/include/KF5/ModemManagerQt/
/usr/include/KF5/ModemManagerQt/Bearer
/usr/include/KF5/ModemManagerQt/GenericTypes
/usr/include/KF5/ModemManagerQt/Interface
/usr/include/KF5/ModemManagerQt/Manager
/usr/include/KF5/ModemManagerQt/Modem
/usr/include/KF5/ModemManagerQt/Modem3Gpp
/usr/include/KF5/ModemManagerQt/Modem3GppUssd
/usr/include/KF5/ModemManagerQt/ModemCdma
/usr/include/KF5/ModemManagerQt/ModemDevice
/usr/include/KF5/ModemManagerQt/ModemFirmware
/usr/include/KF5/ModemManagerQt/ModemLocation
/usr/include/KF5/ModemManagerQt/ModemMessaging
/usr/include/KF5/ModemManagerQt/ModemOma
/usr/include/KF5/ModemManagerQt/ModemSignal
/usr/include/KF5/ModemManagerQt/ModemSimple
/usr/include/KF5/ModemManagerQt/ModemTime
/usr/include/KF5/ModemManagerQt/Sim
/usr/include/KF5/ModemManagerQt/Sms
/usr/include/KF5/ModemManagerQt/bearer.h
/usr/include/KF5/ModemManagerQt/generictypes.h
/usr/include/KF5/ModemManagerQt/interface.h
/usr/include/KF5/ModemManagerQt/manager.h
/usr/include/KF5/ModemManagerQt/modem.h
/usr/include/KF5/ModemManagerQt/modem3gpp.h
/usr/include/KF5/ModemManagerQt/modem3gppussd.h
/usr/include/KF5/ModemManagerQt/modemcdma.h
/usr/include/KF5/ModemManagerQt/modemdevice.h
/usr/include/KF5/ModemManagerQt/modemfirmware.h
/usr/include/KF5/ModemManagerQt/modemlocation.h
/usr/include/KF5/ModemManagerQt/modemmanagerqt_export.h
/usr/include/KF5/ModemManagerQt/modemmessaging.h
/usr/include/KF5/ModemManagerQt/modemoma.h
/usr/include/KF5/ModemManagerQt/modemsignal.h
/usr/include/KF5/ModemManagerQt/modemsimple.h
/usr/include/KF5/ModemManagerQt/modemtime.h
/usr/include/KF5/ModemManagerQt/sim.h
/usr/include/KF5/ModemManagerQt/sms.h
/usr/include/KF5/modemmanagerqt_version.h