pmattern [1] filed an adoption request for pnm2ppa [2]: I'm still using one of the devices covered by this package on a regular basis and would therefore like to maintain it.
Also, I would like to check, whether this driver can still be used
under CUPS 3.x using corresponding packages like libcups-git,
cups-{local,sharing}-git and pappl-retrofit-git, which I'm maintaining
as well.
[1] https://aur.archlinux.org/account/pmattern/
[2] https://aur.archlinux.org/pkgbase/pnm2ppa/
