MarsSeed [1] filed a deletion request for rgbdemo [2]: Dead package from ~10+ years ago. With now nonexistent dependencies like 'eigen3', 'libflann', or 'qt'.
Upstream hasn't released a new version since 2012. [a] [a]: https://sourceforge.net/projects/roboticslab/files [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/rgbdemo/
