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<h1>FAQ: Upgrades, Old Bugs and Migration</h1>

<ul>
    <li><a href="upgrades.html#world-0.26.0_alpha13">World changes in 0.26.0_alpha13</a></li>
</ul>

<h2 id="world-0.26.0_alpha13">World changes in 0.26.0_alpha13</h2>

<p>Before 0.26.0_alpha13, every installed package repository had its own individual <code>world</code>
set handling code. Now instead there is a single global <code>world</code> file maintained by the
environment.</p>

<p>If you are using the Portage configuration format, <code>/var/lib/portage/world</code> will continue
to be used, and there is no need to change anything.</p>

<p>If you are using the Paludis configuration format, you must specify the <code>world</code> key
in <a href="../configuration/general.html">general.conf</a>. If this key is not specified,
no file will be written to for world updates.</p>

<p>To ease the upgrade, any <code>world</code> key explicitly specified for a VDB repository will
continue to be used for reading but not writing.</p>