anchor.diff:      ++ optionals withPython3 [ python3 ncurses ]
       ++ optional withPHP72 php72-unit
       ++ optional withPHP73 php73-unit
  +    ++ optional withPHP73 php74-unit
       ++ optional withPerl528 perl528
       ++ optional withPerl530 perl530
       ++ optional withPerldevel perldevel
  
positive.code: 
    php72-unit = php72.override phpConfig;
    php73-unit = php73.override phpConfig;
  in stdenv.mkDerivation rec {
    version = "1.17.0";
    pname = "unit";
  
negative.code: , withPython2 ? false, python2
  , withPython3 ? true, python3, ncurses
  , withPHP72 ? false, php72
  , withPHP73 ? false, php73
  , withPHP74 ? true, php74
  , withPerl528 ? false, perl528
  , withPerl530 ? true, perl530
  , withPerldevel ? false, perldevel
  