/usr/include/ is in htcondor-dev 8.4.2~dfsg.1-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/condor/
/usr/include/condor/file_lock.h
/usr/include/condor/MyString.h
/usr/include/condor/condor_header_features.h
/usr/include/condor/condor_holdcodes.h
/usr/include/condor/condor_constants.h
/usr/include/condor/condor_event.h
/usr/include/condor/iso_dates.h
/usr/include/condor/user_log.c++.h
/usr/include/condor/compat_classad_util.h
/usr/include/condor/write_user_log.h
/usr/include/condor/stl_string_utils.h
/usr/include/condor/chirp_client.h
/usr/include/condor/condor_classad.h
/usr/include/condor/compat_classad.h
/usr/include/condor/compat_classad_list.h
/usr/include/condor/read_user_log.h