anchor.diff:  
   with {
     inherit (stdenv.lib)
  +    enFlag
  +    optionals
       wtFlag;
   };
   
  
positive.code: 
  stdenv.mkDerivation rec {
    name = "eog-${version}";
    versionMajor = "3.18";
    versionMinor = "2";
    version = "${versionMajor}.${versionMinor}";
  
    src = fetchurl {
      url = "mirror://gnome/sources/eog/${versionMajor}/${name}.tar.xz";
      sha256 = "0dp6kxs4yl8sd0l6qbr874pdzi4rfmp5izk169q15bacfpiicbfw";
    };
  
    nativeBuildInputs = [
  
negative.code:     "--disable-gtk-doc-html"
      "--disable-gtk-doc-pdf"
      "--enable-nls"
      (enFlag "introspection" (gobject-introspection != null) null)
      "--enable-schemas-compile"
      "--disable-installed-tests"
      (wtFlag "libexif" (libexif != null) null)
  