anchor.diff:  
     postBuild = ''
       wrapProgram $out/bin/image_optim \
  -      --prefix PATH : ${optionalDepsPath}
  +      --prefix PATH : ${makeBinPath optionalDepsPath}
     '';
   
     meta = with lib; {
  
positive.code:     ++ optional withJpegrecompress jpeg-archive
      ++ optional withJpegtran libjpeg
      ++ optional withGifsicle gifsicle
      ++ optional withSvgo svgo
    );
  in
  
  bundlerApp {
  
negative.code: with lib;
  
  let
    optionalDepsPath = []
      ++ optional withPngcrush pngcrush
      ++ optional withPngout pngout
      ++ optional withAdvpng advancecomp
  