manual = pkgs.runCommand "hydra-manual-${version}"
    { build = builtins.storePath /nix/store/pi4dqvk3r5jlnbdb4lic5jff3wzn01qh-hydra-0.1.1234.abcdef;
    }
    ''
      mkdir -p $out/share
      cp -prvd $build/share/doc $out/share/

      mkdir $out/nix-support
      echo "doc manual $out/share/doc/hydra" >> $out/nix-support/hydra-build-products
    '';