On Thu, May 30, 2013 at 4:35 PM, 郑文辉(Techlive Zheng) <techlivezheng@gmail.com> wrote:

When packages listed in a package's 'optdepeds' field are installed using `--asdeps` option, as long as the package which list these packages as 'optdepends' exists, these packages should not be listed bu `pacman -Qdt`.

See https://bbs.archlinux.org/viewtopic.php?id=163781 for some ways to work around this until optdepends handling is fully implemented in pacman.