/usr/include/mimedir-1.0/mimedir/ is in libmimedir-gnome-dev 0.4.2-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/mimedir-1.0/mimedir/mimedir-attachment.h
/usr/include/mimedir-1.0/mimedir/mimedir-attendee.h
/usr/include/mimedir-1.0/mimedir/mimedir-attribute.h
/usr/include/mimedir-1.0/mimedir/mimedir-datetime.h
/usr/include/mimedir-1.0/mimedir/mimedir-init.h
/usr/include/mimedir-1.0/mimedir/mimedir-period.h
/usr/include/mimedir-1.0/mimedir/mimedir-profile.h
/usr/include/mimedir-1.0/mimedir/mimedir-recurrence.h
/usr/include/mimedir-1.0/mimedir/mimedir-valarm.h
/usr/include/mimedir-1.0/mimedir/mimedir-vcal.h
/usr/include/mimedir-1.0/mimedir/mimedir-vcard-address.h
/usr/include/mimedir-1.0/mimedir/mimedir-vcard-email.h
/usr/include/mimedir-1.0/mimedir/mimedir-vcard-phone.h
/usr/include/mimedir-1.0/mimedir/mimedir-vcard.h
/usr/include/mimedir-1.0/mimedir/mimedir-vcomponent.h
/usr/include/mimedir-1.0/mimedir/mimedir-vevent.h
/usr/include/mimedir-1.0/mimedir/mimedir-vfreebusy.h
/usr/include/mimedir-1.0/mimedir/mimedir-vjournal.h
/usr/include/mimedir-1.0/mimedir/mimedir-vtimezone.h
/usr/include/mimedir-1.0/mimedir/mimedir-vtodo.h
/usr/include/mimedir-1.0/mimedir/mimedir.h