anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "vips";
  -  version = "8.9.1";
  +  version = "8.9.2";
   
     outputs = [ "bin" "out" "man" "dev" ];
   
  
positive.code: , libjpeg
  , libgsf
  , libexif
  , ApplicationServices
  , python27
  , libpng ? null
  , fetchFromGitHub
  , fetchpatch
  , autoreconfHook
  
negative.code:     libjpeg
      libgsf
      libexif
      libheif
      libpng
      python27
      libpng
      expat
  