Hi, FYI, it is much easier to comment (and separate comments from the patch) if things are posted inline. Here goes some brief comments in cut paste sort of format... hopefully you can follow them. Anyway, overall this looks quite good. Make these small adjustments it is basically good to go. Even better if you submit as a patch with the necessary autotools changes, but I can handle those if not.
Description ----------- The script *pacman-key* manage *pacman*'s keyring, ie the keyring of GnuPG keys used to sign packages. It enables to import, export and fetch keys from keyservers as well as update the key trust database.
Hmm... how about something like: The script *pacman-key* manage *pacman*'s keyring, which is the collection of GnuPG keys used to check signed packages. It provides the ability to import and export keys, fetch keys from keyservers and update the key trust database.
*\--config* 'file':: Set an alternative configuration file to use (default is /etc/pacman.conf)
you should use {sysconfdir}/pacman.conf instead so we can adjust this based on the configure output.
*-l*, *\--list*:: List keys and signatures in pacman's keyring. Same as option \--list-sigs of GnuPG. See GnuPG's man pages for flag significations
Equivalent to --list-sigs from GnuPG. (?)
*-u*, *\--updatedb*:: Update the trustdb of pacman. Same as option \--check-trustdb of GnuPG.
Equivalent to \--check-trustdb in GnuPG Allan