anchor.diff:  , withPython3 ? true, python3, ncurses
   , withPHP74 ? false, php74
   , withPHP80 ? true, php80
  -, withPerl530 ? false, perl530
  -, withPerl532 ? true, perl532
  +, withPerl532 ? false, perl532
  +, withPerl534 ? true, perl534
   , withPerldevel ? false, perldevel
   , withRuby_2_6 ? true, ruby_2_6
   , withRuby_2_7 ? false, ruby_2_7
  
positive.code:     ${optionalString withPython3    "./configure python --module=python3  --config=python3-config  --lib-path=${python3}/lib"}
      ${optionalString withPHP74      "./configure php    --module=php74    --config=${php74-unit.unwrapped.dev}/bin/php-config --lib-path=${php74-unit}/lib"}
      ${optionalString withPHP80      "./configure php    --module=php80    --config=${php80-unit.unwrapped.dev}/bin/php-config --lib-path=${php80-unit}/lib"}
      ${optionalString withPerl530    "./configure perl   --module=perl530  --perl=${perl530}/bin/perl"}
      ${optionalString withPerl532    "./configure perl   --module=perl532  --perl=${perl532}/bin/perl"}
      ${optionalString withPerldevel  "./configure perl   --module=perldev  --perl=${perldevel}/bin/perl"}
      ${optionalString withRuby_2_6   "./configure ruby   --module=ruby26   --ruby=${ruby_2_6}/bin/ruby"}
      ${optionalString withRuby_2_7   "./configure ruby   --module=ruby27   --ruby=${ruby_2_7}/bin/ruby"}
  
negative.code:     ++ optionals withPython3 [ python3 ncurses ]
      ++ optional withPHP74 php74-unit
      ++ optional withPHP80 php80-unit
      ++ optional withPerl532 perl532
      ++ optional withPerl534 perl534
      ++ optional withPerldevel perldevel
      ++ optional withRuby_2_6 ruby_2_6
      ++ optional withRuby_2_7 ruby_2_7
  