anchor.diff:    buildInputs = [
       gst-plugins-base
       orc
  +    # gobject-introspection has to be in both nativeBuildInputs and
  +    # buildInputs. The build tries to link against libgirepository-1.0.so
       gobject-introspection
       faad2
       libass
  
positive.code:   };
  
    patches = [
      ./fix_pkgconfig_includedir.patch
    ];
  
  
negative.code: { lib, stdenv
  , fetchurl
  , meson
  , ninja
  , gettext
  , pkg-config
  , python3
  , gst-plugins-base
  