nixpkgs/nixos/doc/manual/release-notes/rl-1709.xml

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         xml:id="sec-release-17.09">

<title>Release 17.09 (“Hummingbird”, 2017/09/??)</title>

<para>In addition to numerous new and upgraded packages, this release
has the following highlights: </para>

<itemizedlist>
  <listitem>
    <para>
      The user handling now keeps track of deallocated UIDs/GIDs. When a user
      or group is revived, this allows it to be allocated the UID/GID it had before.
      A consequence is that UIDs and GIDs are no longer reused.
    </para>
  </listitem>

</itemizedlist>

<para>The following new services were added since the last release:</para>

<itemizedlist>
  <listitem>
    <para></para>
  </listitem>
</itemizedlist>


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

<itemizedlist>
  <listitem>
    <para>
    </para>
  </listitem>
</itemizedlist>


<para>Other notable improvements:</para>

<itemizedlist>

  <listitem>
    <para>
      Modules can now be disabled by using <link
      xlink:href="https://nixos.org/nixpkgs/manual/#sec-replace-modules">
      disabledModules</link>, allowing another to take it's place.  This can be
      used to import a set of modules from another channel while keeping the
      rest of the system on a stable release.
    </para>
  </listitem>
  <listitem>
    <para>
      Updated to FreeType 2.7.1, including a new TrueType engine.
      The new engine replaces the Infinality engine which was the default in
      NixOS. The default font rendering settings are now provided by
      fontconfig-penultimate, replacing fontconfig-ultimate; the new defaults
      are less invasive and provide rendering that is more consistent with
      other systems and hopefully with each font designer's intent. Some
      system-wide configuration has been removed from the Fontconfig NixOS
      module where user Fontconfig settings are available.
    </para>
  </listitem>

</itemizedlist>

</section>