anchor.diff:      chmod -R +w gmic gmic_qt
       ln -s ${CImg} CImg
   
  -    cp ${gmic_stdlib} gmic/gmic_stdlib.h
  +    cp ${gmic_stdlib} gmic/src/gmic_stdlib.h
   
       make -C gmic/src CImg.h gmic_stdlib.h
       cd gmic_qt
  
positive.code: { stdenv, fetchurl, fetchFromGitHub, cmake, ninja, pkgconfig, qt5
  , opencv, openexr, graphicsmagick, fftw, zlib, libjpeg, libtiff, libpng
  , curl, krita
  , fetchgit, withGimpPlugin ? true, gimp }:
  
  let
  
negative.code:   nativeBuildInputs = [ cmake pkgconfig ];
  
    buildInputs = [
      qt5.qtbase qt5.qttools gimp gdk_pixbuf fftw zlib libjpeg libtiff libpng
      opencv openexr graphicsmagick curl cairo krita
    ];
  
    cmakeFlags = [ "-DGMIC_QT_HOST=krita" ];
  
    installPhase = ''
      mkdir -p $out/bin;
  