The stories is like this.

I sync up the ABS repository and want to download the all sources to local first, then i can build what i want.
I have several ways to do that,

makeworld -o /home/packages core It downloads, but it extracts source package which i don't need it.
makeworld -o -e /home/packages core I assume it downloads and not extract, but it actually even doesn't download.

well, some one suggest me with 'makepkg -g'

$push core/bash
$makepkg -g - then, it does dowload and doesn't extract or build. that's good.

but
makeworld -g /package core

gives a error. "/usr/bin/makeworld: illegal option: -g"

Request to support -g options for makeworld.