anchor.diff:      libjpeg
       libpng
       libmng
  -    lcms1
  +    lcms
       libtiff
       openexr
       mesa
  
positive.code: , libjpeg
  , libpng
  , libmng
  , lcms1
  , libtiff
  , openexr
  , mesa
  
negative.code:   name ="devil-${version}";
  
    src = fetchurl {
      url = "mirror://sourceforge/openil/DevIL/${version}/"
        + "DevIL-${version}.tar.gz";
      sha256 = "1zd850nn7nvkkhasrv7kn17kzgslr5ry933v6db62s4lr0zzlbv8";
    };
  
  