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<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude" xml:id="sec-package-management">
<title>Package Management</title>
<para>
This section describes how to add additional packages to your
system. NixOS has two distinct styles of package management:
</para>
<itemizedlist>
<listitem>
<para>
<emphasis>Declarative</emphasis>, where you declare what
packages you want in your <literal>configuration.nix</literal>.
Every time you run <literal>nixos-rebuild</literal>, NixOS will
ensure that you get a consistent set of binaries corresponding
to your specification.
</para>
</listitem>
<listitem>
<para>
<emphasis>Ad hoc</emphasis>, where you install, upgrade and
uninstall packages via the <literal>nix-env</literal> command.
This style allows mixing packages from different Nixpkgs
versions. It’s the only choice for non-root users.
</para>
</listitem>
</itemizedlist>
<xi:include href="declarative-packages.section.xml" />
<xi:include href="ad-hoc-packages.section.xml" />
</chapter>
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