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<chapter>
<title>Installation</title>
<sect1>
<title>Obtaining Nix</title>
<para>
The easiest way to obtain Nix is to download a <ulink
url='http://www.cs.uu.nl/groups/ST/Trace/Nix'>source
distribution.</ulink>
</para>
<para>
Alternatively, the most recent sources of Nix can be obtained from its
<ulink url='https://svn.cs.uu.nl:12443/repos/trace/nix/trunk'>Subversion
repository</ulink>. For example, the following command will check out
the latest revision into a directory called <filename>nix</filename>:
</para>
<screen>
$ svn checkout https://svn.cs.uu.nl:12443/repos/trace/nix/trunk nix</screen>
<para>
Likewise, specific releases can be obtained from the <ulink
url='https://svn.cs.uu.nl:12443/repos/trace/nix/tags'>tags
directory</ulink> of the repository. If you don't have Subversion, you
can also download an automatically generated <ulink
url='https://svn.cs.uu.nl:12443/dist/trace/'>compressed
tar-file</ulink> of the head revision of the trunk.
</para>
</sect1>
<sect1>
<title>Prerequisites</title>
<para>
A fairly recent version of GCC/G++ is required. Version 2.95 and higher
should work.
</para>
<para>
To rebuild this manual and the man-pages you need the
<command>xmllint</command> and <command>xsltproc</command>, which are
part of the <literal>libxml2</literal> and <literal>libxslt</literal>
packages, respectively. You also need the <ulink
url='http://docbook.sourceforge.net/projects/xsl/'>DocBook XSL
stylesheets</ulink> and optionally the <ulink
url='http://www.oasis-open.org/docbook/xml/4.2/docbook-xml-4.2.zip'>
DocBook XML 4.2 DTD</ulink>. Note that these are only required if you
modify the manual sources or when you are building from the Subversion
repository.
</para>
<para>
Nix uses Sleepycat's Berkeley DB, CWI's ATerm library, and SDF parser
library. These are included in the Nix source distribution. If you
build from the Subversion repository, you must download them yourself and
place them in the <filename>externals/</filename> directory. See
<filename>externals/Makefile.am</filename> for the precise URLs of these
packages.
</para>
</sect1>
<sect1>
<title>Building Nix</title>
<para>
After unpacking or checking out the Nix sources, issue the following
commands:
</para>
<screen>
$ ./configure <replaceable>options...</replaceable>
$ make
$ make install</screen>
<para>
When building from the Subversion repository, these should be preceded by
the command:
</para>
<screen>
$ autoreconf -i</screen>
<para>
The installation path can be specified by passing the
<option>--prefix=<replaceable>prefix</replaceable></option> to
<command>configure</command>. The default installation directory is
<filename>/nix</filename>. You can change this to any location you like.
You must have write permission to the <replaceable>prefix</replaceable>
path.
</para>
<warning>
<para>
It is advisable <emphasis>not</emphasis> to change the installation
prefix from its default, since doing so will in all likelihood make it
impossible to use derivations built on other systems.
</para>
</warning>
<para>
If you want to rebuilt the documentation, pass the full path to the
DocBook XML catalog file (<filename>docbook.cat</filename>) and to the
DocBook XSL stylesheets using the
<option>--with-docbook-catalog=<replaceable>path</replaceable></option>
and <option>--with-docbook-xsl=<replaceable>path</replaceable></option>
options.
</para>
</sect1>
<sect1>
<title>Using Nix</title>
<para>
To use Nix, some environment variables should be set. In particular,
<envar>PATH</envar> should contain the directories
<filename><replaceable>prefix</replaceable>/bin</filename> and
<filename><replaceable>prefix</replaceable>/var/nix/links/current/bin</filename>.
The first directory contains the Nix tools themselves, while the second
contains to the current <emphasis>user environment</emphasis> (an
automatically generated package consisting of symlinks to installed
packages). The simplest way to set the required environment variables is
to include the file
<filename><replaceable>prefix</replaceable>/etc/profile.d/nix.sh</filename>
in your <filename>~/.bashrc</filename> (or similar), like this:
</para>
<screen>
. <replaceable>prefix</replaceable>/etc/profile.d/nix.sh</screen>
</sect1>
</chapter>
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