Drop the externals directory

Nix now requires SQLite and bzip2 to be pre-installed.  SQLite is
detected using pkg-config.  We required DBD::SQLite anyway, so
depending on SQLite is not a big problem.

The --with-bzip2, --with-openssl and --with-sqlite flags are gone.

1 files changed, 30 insertions, 17 deletions

diff --git a/doc/manual/installation.xml b/doc/manual/installation.xml
index 755f53907..15c156dab 100644
--- a/doc/manual/installation.xml
+++ b/doc/manual/installation.xml
@@ -69,7 +69,36 @@ from source</emphasis>.  Binary releases (e.g., RPMs) have no
 prerequisites.</para>
 
 <para>A fairly recent version of GCC/G++ is required.  Version 2.95
-and higher should work.</para>
+and higher should work.  Clang will also work.</para>
+
+<para>Nix requires Perl, version 5.8 or higher.</para>
+
+<para>Nix requires <command>pkg-config</command> to locate its
+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>
+
+<para>Nix requires 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>
+
+<para>Nix requires the SQLite embedded database library.  If your
+distribution does not provide it, please install it from <link
+xlink:href="http://www.sqlite.org/" />.</para>
+
+<para>Nix requires 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>
+
+<para>Nix can optionally use the <link
+xlink:href="http://www.hpl.hp.com/personal/Hans_Boehm/gc/">Boehm
+garbage collector</link> to reduce the evaluator’s memory consumption.
+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>
 
 <para>To build this manual and the man-pages you need the
 <command>xmllint</command> and <command>xsltproc</command> programs,
@@ -96,22 +125,6 @@ ubiquitous 2.5.4a won't.  Note that these are only required if you
 modify the parser or when you are building from the Subversion
 repository.</para>
 
-<para>Nix uses the bzip2 compressor (including the bzip2 library).  It
-is included in the Nix source distribution.  If you build from the
-Subversion repository, you must download it yourself and place it in
-the <filename>externals/</filename> directory.  See
-<filename>externals/Makefile.am</filename> for the precise URLs of
-this packages.  Alternatively, if you already have it installed, you
-can use <command>configure</command>'s <option>--with-bzip2</option>
-options to point to their respective locations.</para>
-
-<para>Nix can optionally use the <link
-xlink:href="http://www.hpl.hp.com/personal/Hans_Boehm/gc/">Boehm
-garbage collector</link> to reduce the evaluator’s memory consumption.
-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>
-
 </section>