MarsSeed [1] filed a deletion request for i2p-dev [2]: 9 months older version than the stable package for the same, and not even flagged OOD. It seems this package is both unmaintained and not needed by users.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/i2p-dev/
