anchor.diff:      python3
       vala
       wrapGAppsHook
  -    yelp-tools
     ];
   
     buildInputs = [
  
positive.code: , docbook_xsl
  , appstream-glib
  , libxslt
  , yelp-tools
  , gnome-common
  , gtk-doc
  , adwaita-icon-theme
  
negative.code: { lib, stdenv
  , gettext
  , fetchurl
  , fetchpatch
  , wrapGAppsHook
  , gnome-video-effects
  , libcanberra-gtk3
  