MarsSeed [1] filed a deletion request for gollum [2]: Broken Ruby gem, not maintained for a long time. Better to delete. If someone needs it, they can install the latest version to their HOME dir via rubygems CLI, as outlined in Arch Wiki's Ruby article.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/gollum/
