anchor.diff:  
     nativeBuildInputs = [
       flex
  -    perl
  -    python3
  +    meson
  +    ninja
     ];
   
     buildInputs = [
  
positive.code:     libxml2
    ];
  
    configureFlags = [
      "--disable-maintainer-mode"
      "--disable-fatal-warnings"
      "--disable-extra-checks"
      "--disable-debug"
      "--disable-profiling"
      "--disable-valgrind"
      "--disable-gcov"
      "--disable-examples"
      "--${boolEn (gobject-introspection != null)}-introspection"
      "--disable-docbook"
      "--disable-gtk-doc"
      "--disable-gtk-doc-html"
      "--disable-gtk-doc-pdf"
      "--enable-gobject-cast-checks"
      "--disable-glib-asserts"
      "--enable-plugins"
      "--enable-Bsymbolic"
      "--disable-benchmarks"
      "--disable-static-plugins"
      #"--with-bash-completion-dir"
      "--without-gtk"
    ];
  
    passthru = {
  
negative.code: , fetchurl
  , flex
  , lib
  , meson
  , ninja
  
  , glib
  , gnonlin
  