hallo,
--usepkg (-k short option)
Tell emerge to use binary packages (from $PKGDIR) if they are
available, thus possibly avoiding some time-consuming compiles.
This option is useful for CD installs; you can export
PKGDIR=/mnt/cdrom/packages and then use this option to have
emerge "pull" binary packages from the CD in order to satisfy
dependencies.
--usepkgonly (-K short option)
Like --usepkg above, except this only allows the use of binary
packages, and it will abort the emerge if the package is not
available at the time of dependency calculation.
gruß boxhamster