anchor.diff:                      # usage: https://uwsgi-docs.readthedocs.io/en/latest/PHP.html#running-php-apps-with-nginx
                       path = "plugins/php";
                       inputs = [ php-embed ] ++ php-embed.buildInputs;
  +                    NIX_CFLAGS_LINK = [ "-L${mysql.connector-c}/lib/mysql" ];
                     })
                   ];
   
  
positive.code: , pam, withPAM ? false
  , systemd, withSystemd ? false
  , python2, python3, ncurses
  , ruby, php-embed
  }:
  
  let pythonPlugin = pkg : lib.nameValuePair "python${if pkg ? isPy2 then "2" else "3"}" {
  
negative.code:     ${lib.concatMapStringsSep "\n" (x: x.install or "") needed}
    '';
  
    NIX_CFLAGS_LINK = [ "-lsystemd" ] ++ lib.concatMap (x: x.NIX_CFLAGS_LINK or []) needed;
  
    meta = with stdenv.lib; {
      homepage = http://uwsgi-docs.readthedocs.org/en/latest/;
  