/usr/include/wx-3.0/wx/unix/ is in wx3.0-headers 3.0.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/wx-3.0/wx/unix/app.h
/usr/include/wx-3.0/wx/unix/apptbase.h
/usr/include/wx-3.0/wx/unix/apptrait.h
/usr/include/wx-3.0/wx/unix/chkconf.h
/usr/include/wx-3.0/wx/unix/evtloop.h
/usr/include/wx-3.0/wx/unix/evtloopsrc.h
/usr/include/wx-3.0/wx/unix/execute.h
/usr/include/wx-3.0/wx/unix/fontutil.h
/usr/include/wx-3.0/wx/unix/fswatcher_inotify.h
/usr/include/wx-3.0/wx/unix/fswatcher_kqueue.h
/usr/include/wx-3.0/wx/unix/glx11.h
/usr/include/wx-3.0/wx/unix/joystick.h
/usr/include/wx-3.0/wx/unix/mimetype.h
/usr/include/wx-3.0/wx/unix/pipe.h
/usr/include/wx-3.0/wx/unix/sound.h
/usr/include/wx-3.0/wx/unix/stackwalk.h
/usr/include/wx-3.0/wx/unix/stdpaths.h
/usr/include/wx-3.0/wx/unix/taskbarx11.h
/usr/include/wx-3.0/wx/unix/tls.h
/usr/include/wx-3.0/wx/unix/utilsx11.h