anchor.diff:  
     src = fetchurl {
       url = "mirror://gnome/sources/gtk/${lib.versions.majorMinor version}/gtk-${version}.tar.xz";
  -    sha256 = "XOjY3piiO9DI7KGmEJThwAm18AncvWC0XpkKjbG3Qv0=";
  +    sha256 = "hbehYLbgLq+k59OPBG+HIPq1N9P+c8AchkMzqYOmkqk=";
     };
   
     depsBuildBuild = [
  
positive.code:     chmod +x ''${files[@]}
      patchShebangs ''${files[@]}
  
    '' +
    # Run-time dependency gi-docgen found: NO (tried pkgconfig and cmake)
    # it should be a build-time dep for build
    # TODO: send upstream
    ''
      substituteInPlace meson.build \
        --replace "'gi-docgen', ver" "'gi-docgen', native:true, ver"
    '';
  
    preInstall = ''
  
negative.code: 
    postPatch = ''
      files=(
        build-aux/meson/gen-demo-header.py
        demos/gtk-demo/geninclude.py
        gdk/broadway/gen-c-array.py
  