anchor.diff: -{ lib, stdenv
  +{ lib
  +, stdenv
   , fetchurl
   , colord
   , gettext
  
positive.code:     gobject-introspection
      gtk-doc
      docbook-xsl-ns
      docbook_xsl
      docbook_xml_dtd_412
      libxslt
    ];
  
negative.code:   propagatedBuildInputs = [
      colord
      gtk3
      gtk4
    ];
  
    meta = with lib; {
  