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<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="sec-prerequisites-source">
<title>Prerequisites</title>
<itemizedlist>
<listitem><para>GNU Make.</para></listitem>
<listitem><para>A version of GCC or Clang that supports C++14.</para></listitem>
<listitem><para><command>pkg-config</command> to locate
dependencies. If your distribution does not provide it, you can get
it from <link
xlink:href="http://www.freedesktop.org/wiki/Software/pkg-config"
/>.</para></listitem>
<listitem><para>The OpenSSL library to calculate cryptographic hashes.
If your distribution does not provide it, you can get it from <link
xlink:href="https://www.openssl.org"/>.</para></listitem>
<listitem><para>The bzip2 compressor program and the
<literal>libbz2</literal> library. Thus you must have bzip2
installed, including development headers and libraries. If your
distribution does not provide these, you can obtain bzip2 from <link
xlink:href="http://www.bzip.org/"/>.</para></listitem>
<listitem><para>The SQLite embedded database library, version 3.6.19
or higher. If your distribution does not provide it, please install
it from <link xlink:href="http://www.sqlite.org/" />.</para></listitem>
<listitem><para>The <link
xlink:href="http://www.hboehm.info/gc/">Boehm
garbage collector</link> to reduce the evaluator’s memory
consumption (optional). To enable it, install
<literal>pkgconfig</literal> and the Boehm garbage collector, and
pass the flag <option>--enable-gc</option> to
<command>configure</command>.</para></listitem>
<listitem><para>The <command>xmllint</command> and
<command>xsltproc</command> programs to build this manual and the
man-pages. These are part of the <literal>libxml2</literal> and
<literal>libxslt</literal> packages, respectively. You also need
the <link
xlink:href="http://docbook.sourceforge.net/projects/xsl/">DocBook
XSL stylesheets</link> and optionally the <link
xlink:href="http://www.docbook.org/schemas/5x"> DocBook 5.0 RELAX NG
schemas</link>. Note that these are only required if you modify the
manual sources or when you are building from the Git
repository.</para></listitem>
<listitem><para>Recent versions of Bison and Flex to build the
parser. (This is because Nix needs GLR support in Bison and
reentrancy support in Flex.) For Bison, you need version 2.6, which
can be obtained from the <link
xlink:href="ftp://alpha.gnu.org/pub/gnu/bison">GNU FTP
server</link>. For Flex, you need version 2.5.35, which is
available on <link
xlink:href="http://lex.sourceforge.net/">SourceForge</link>.
Slightly older versions may also work, but ancient versions like the
ubiquitous 2.5.4a won't. Note that these are only required if you
modify the parser or when you are building from the Git
repository.</para></listitem>
</itemizedlist>
</section>
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