anchor.diff:            ];
   
           buildDeps =
  -          [ bison
  -            flex
  -            libxml2
  -            libxslt
  -            docbook5
  -            docbook_xsl_ns
  -            autoconf-archive
  -            autoreconfHook
  -
  -            curl
  +          [ curl
               bzip2 xz brotli zlib editline
  -            openssl pkgconfig sqlite
  +            openssl sqlite
               libarchive
               boost
               (if lib.versionAtLeast lib.version "20.03pre"
  
positive.code: 
              src = self;
  
              buildInputs =
                [ autoconf-archive
                  autoreconfHook
                  nix
                  curl
                  bzip2
                  xz
                  pkgconfig
                  pkgs.perl
                  boost
                ]
  
negative.code:             buildPackages.libxslt
              buildPackages.docbook5
              buildPackages.docbook_xsl_ns
              buildPackages.autoconf-archive
              buildPackages.autoreconfHook
              buildPackages.pkgconfig
  
  