FAQ: Upgrades, Old Bugs and Migration
World changes in 0.26.0_alpha13
Before 0.26.0_alpha13, every installed package repository had its own individual world
set handling code. Now instead there is a single global world file maintained by the
environment.
If you are using the Portage configuration format, /var/lib/portage/world will continue
to be used, and there is no need to change anything.
If you are using the Paludis configuration format, you must specify the world key
in general.conf. If this key is not specified,
no file will be written to for world updates.
To ease the upgrade, any world key explicitly specified for a VDB repository will
continue to be used for reading but not writing.