craftyguy [1] filed a deletion request for prosody-mod-muc-mam-hints- hg [2]:
the prosody-modules-hg package in AUR is better suited to provide this lesser used module [1] https://aur.archlinux.org/account/craftyguy/ [2] https://aur.archlinux.org/pkgbase/prosody-mod-muc-mam-hints-hg/
