portage # emerge -av prosody::lua
These are the packages that would be merged, in order:
Calculating dependencies... done!
[ebuild U *] net-im/prosody-9999::lua [0.8.2::gentoo] USE="ipv6%* libevent* sqlite ssl zlib -doc% -luajit% -migration% -mysql -postgres" 0 kB
Total: 1 package (1 upgrade), Size of downloads: 0 kB
The following keyword changes are necessary to proceed:
(see "package.accept_keywords" in the portage(5) man page for more details)
# required by prosody::lua (argument)
=net-im/prosody-9999 **
NOTE: The --autounmask-keep-masks option will prevent emerge
from creating package.unmask or ** keyword changes.
Use --autounmask-write to write changes to config files (honoring
CONFIG_PROTECT). Carefully examine the list of proposed changes,
paying special attention to mask or keyword changes that may expose
experimental or unstable packages.