anchor.diff:      meson
       ninja
       pkg-config
  -    python3
  +    python
       gobject-introspection
       gst-plugins-base
     ];
  
positive.code:   ];
  
    mesonFlags = [
      "-Dpygi-overrides-dir=${placeholder "out"}/${python3.sitePackages}/gi/overrides"
    ];
  
    doCheck = true;
  
negative.code: , ninja
  
  , pkg-config
  , python
  , pygobject3
  , gobject-introspection
  , gst-plugins-base
  