anchor.diff:  , file, libvirt, glib, vips, taglib, libopus, linux-pam, libidn, protobuf, fribidi, harfbuzz
   , bison, flex, pango, python3, patchelf, binutils, freetds, wrapGAppsHook, atk
   , bundler, libsass, libexif, libselinux, libsepol, shared-mime-info, libthai, libdatrie
  -, CoreServices, DarwinTools, cctools, libtool, discount
  +, CoreServices, DarwinTools, cctools, libtool, discount, exiv2, libmaxminddb
   }@args:
   
   let
  
positive.code:       substituteInPlace lib/ethon/curls/settings.rb \
          --replace "libcurl" "${curl.out}/lib/libcurl${stdenv.hostPlatform.extensions.sharedLibrary}"
      '';
    };
  
    fog-dnsimple = attrs:
  
negative.code:     '';
    };
  
    maxmind_geoip2 = attrs: {
      buildFlags = [ "--with-maxminddb-lib=${libmaxminddb}/lib" "--with-maxminddb-include=${libmaxminddb}/include" ];
    };
  
    metasploit-framework = attrs: {
      preInstall = ''
        export HOME=$TMPDIR
  