nixpkgs/nixos/doc/manual/release-notes/rl-1412.xml

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<title>Release 14.12 (“Caterpillar”, 2014/12/??)</title>

<para>When upgrading from a previous release, please be aware of the
following incompatible changes:

<itemizedlist>

  <listitem><para>The default version of Apache httpd is now 2.4. If
  you use the <option>extraConfig</option> option to pass literal
  Apache configuration text, you may need to update it — see <link
  xlink:href="http://httpd.apache.org/docs/2.4/upgrading.html">Apache’s
  documentation</link> for details. If you wish to continue to use
  httpd 2.2, add the following line to your NixOS configuration:

<programlisting>
services.httpd.package = pkgs.apacheHttpd_2_2;
</programlisting>

  </para></listitem>

  <listitem><para>PHP 5.3 has been removed because it is no longer
  supported by the PHP project. A <link
  xlink:href="http://php.net/migration54">migration guide</link> is
  available.</para></listitem>

  <listitem><para>The host side of a container virtual Ethernet pair
  is now called <literal>ve-<replaceable>container-name</replaceable></literal>
  rather than <literal>c-<replaceable>container-name</replaceable></literal>.</para></listitem>

  <listitem><para>GNOME 3.10 support has been dropped. The default GNOME version is now 3.12.</para></listitem>

  <listitem><para>The system-wide default timezone for NixOS installations
  changed from <literal>CET</literal> to <literal>UTC</literal>. To choose
  a different timezone for your system, configure
  <literal>time.timeZone</literal> in
  <literal>configuration.nix</literal>. A fairly complete list of possible
  values for that setting is available at <link
  xlink:href="https://en.wikipedia.org/wiki/List_of_tz_database_time_zones"/>.</para></listitem>

  <listitem><para>GNU screen has been updated to 4.2.1, which breaks
  the ability to connect to sessions created by older versions of
  screen.</para></listitem>

</itemizedlist>

</para>

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