/usr/include/libmbim-glib/ is in libmbim-glib-dev 1.14.0-1+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libmbim-glib/libmbim-glib.h
/usr/include/libmbim-glib/mbim-auth.h
/usr/include/libmbim-glib/mbim-basic-connect.h
/usr/include/libmbim-glib/mbim-cid.h
/usr/include/libmbim-glib/mbim-compat.h
/usr/include/libmbim-glib/mbim-device.h
/usr/include/libmbim-glib/mbim-dss.h
/usr/include/libmbim-glib/mbim-enum-types.h
/usr/include/libmbim-glib/mbim-enums.h
/usr/include/libmbim-glib/mbim-error-types.h
/usr/include/libmbim-glib/mbim-errors.h
/usr/include/libmbim-glib/mbim-message.h
/usr/include/libmbim-glib/mbim-ms-firmware-id.h
/usr/include/libmbim-glib/mbim-ms-host-shutdown.h
/usr/include/libmbim-glib/mbim-phonebook.h
/usr/include/libmbim-glib/mbim-proxy-control.h
/usr/include/libmbim-glib/mbim-proxy.h
/usr/include/libmbim-glib/mbim-qmi.h
/usr/include/libmbim-glib/mbim-sms.h
/usr/include/libmbim-glib/mbim-stk.h
/usr/include/libmbim-glib/mbim-ussd.h
/usr/include/libmbim-glib/mbim-utils.h
/usr/include/libmbim-glib/mbim-uuid.h
/usr/include/libmbim-glib/mbim-version.h