the release note about emerge --autounmask.
package name parts of the atoms.
* The functionality of the autounmask program is emulated by the new emerge
--autounmask option, which outputs required configuration changes for
- package.keywords and package.use.
+ package.accept_keywords and package.use.
* The new emerge --exclude option allows packages to be excluded from the
dependency resolution. Doing so might result in a fatal error. See the
emerge(1) man page for details.