anchor.diff:    pname = "gtk+3";
     version = "3.24.12";
   
  -  outputs = [ "out" "dev" ];
  +  outputs = [ "out" "dev" "devdoc" ];
     outputBin = "dev";
   
     setupHooks = [
  
positive.code:   '';
  
    nativeBuildInputs = [
      gettext
      gobject-introspection
      makeWrapper
      meson
  
negative.code: , fetchpatch
  , pkgconfig
  , gettext
  , docbook_xsl
  , docbook_xml_dtd_43
  , gtk-doc
  , meson
  , ninja
  , python3
  