<listitem>Nix</listitem>
        <listitem>either PostgreSQL or SQLite</listitem>
        <listitem>many Perl packages, notably Catalyst, EmailSender,

        <listitem><para>Nix</para></listitem>
        <listitem><para>either PostgreSQL or SQLite</para></listitem>
        <listitem><para>many Perl packages, notably Catalyst, EmailSender,

        list).</listitem>

        list)</para></listitem>

      Of course we think it is a good idea to use the <a
      href="http://nixos.org/nixos">NixOS</a> GNU/Linux distribution
      for your buildfarm server. But this is not a requirement.  The
      Nix software deployment system can be installed on any GNU/Linux
      distribution in parallel to the regular package management
      system. Thus, you can use Hydra on a Debian, Fedora, SuSE, or
      Ubuntu system.

      Of course we think it is a good idea to use the <link
      xlink:href="http://nixos.org/nixos">NixOS</link> GNU/Linux
      distribution for your buildfarm server. But this is not a
      requirement.  The Nix software deployment system can be
      installed on any GNU/Linux distribution in parallel to the
      regular package management system. Thus, you can use Hydra on a
      Debian, Fedora, SuSE, or Ubuntu system.

      <screen>
  Identifier: patchelf
      </screen>

<screen>
Identifier: patchelf
</screen>

  Display name: Patchelf

Display name: Patchelf

  Description: A tool for modifying ELF binaries

Description: A tool for modifying ELF binaries

  Owner: eelco

Owner: eelco

  Enabled: Yes

Enabled: Yes

  Identifier:     trunk
  Description:    Trunk
  Nix expression: release.nix in input patchelfSrc

Identifier:     trunk
Description:    Trunk
Nix expression: release.nix in input patchelfSrc

  patchelfSrc 
    'Subversion checkout' https://svn.nixos.org/repos/nix/patchelf/trunk

patchelfSrc 
  'Subversion checkout' https://svn.nixos.org/repos/nix/patchelf/trunk

  nixpkgs 'Subversion checkout' https://svn.nixos.org/repos/nix/nixpkgs/trunk

nixpkgs 'Subversion checkout' https://svn.nixos.org/repos/nix/nixpkgs/trunk

  officialRelease   Boolean false

officialRelease   Boolean false

  system   String value "i686-linux" 

system   String value "i686-linux" 

        name = "hello" ;

        name = "hello";

      <screen>
        $ nix-build release.nix -A tarball
      </screen>

<screen>
$ nix-build release.nix -A tarball
</screen>

      <screen>
        error: cannot auto-call a function that has an argument without a default value (`nixpkgs')
      </screen>

<screen>
error: cannot auto-call a function that has an argument without a default value (`nixpkgs')
</screen>

      <screen>
        $ nix-build -I ~/src release.nix -A tarball
      </screen>

<screen>
$ nix-build -I ~/src release.nix -A tarball
</screen>

      <screen>
        $ nix-build -I ~/src release.nix -A build
      </screen>

<screen>
$ nix-build -I ~/src release.nix -A build
</screen>

      <programlisting>
    coverage =
      { tarball ? jobs.tarball {}
      , system ? builtins.currentSystem
      }:

<programlisting>
coverage =
  { tarball ? jobs.tarball {}
  , system ? builtins.currentSystem
  }:

      let pkgs = import nixpkgs { inherit system; }; in
      pkgs.releaseTools.coverageAnalysis {
        name = "hello" ;
        src = tarball;
        configureFlags = [ "--disable-silent-rules" ];
      }; </programlisting>

  let pkgs = import nixpkgs { inherit system; }; in
  pkgs.releaseTools.coverageAnalysis {
    name = "hello";
    src = tarball;
    configureFlags = [ "--disable-silent-rules" ];
  };
</programlisting>

      <programlisting>
    build_exotic =
      { tarball ? jobs.tarball {}
      , system ? builtins.currentSystem
      }:

<programlisting>
build_exotic =
  { tarball ? jobs.tarball {}
  , system ? builtins.currentSystem
  }:

      let
        pkgs = import nixpkgs { inherit system; };
        build = jobs.build { inherit tarball system; };
      in
        pkgs.lib.overrideDerivation build (attrs: {
          buildInputs = [ pkgs.gcc33 ];
          preConfigure = "gcc --version";
          configureFlags =
            attrs.configureFlags ++ [ "--disable-nls" ];
        }); </programlisting>

  let
    pkgs = import nixpkgs { inherit system; };
    build = jobs.build { inherit tarball system; };
  in
    pkgs.lib.overrideDerivation build (attrs: {
      buildInputs = [ pkgs.gcc33 ];
      preConfigure = "gcc --version";
      configureFlags =
        attrs.configureFlags ++ [ "--disable-nls" ];
    });
</programlisting>