Restructuring the Nix manual

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diff --git a/doc/manual/installation/prerequisites-source.xml b/doc/manual/installation/prerequisites-source.xml
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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++11.</para></listitem>
+
+  <listitem><para>Perl 5.8 or higher.</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 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 Perl DBI and DBD::SQLite libraries, which are
+  available from <link
+  xlink:href="http://search.cpan.org/">CPAN</link> if your
+  distribution does not provide them.</para></listitem>
+
+  <listitem><para>The <link
+  xlink:href="http://www.hpl.hp.com/personal/Hans_Boehm/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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