diff --git a/lv2.spec b/lv2.spec
index 16750ed..dc72c87 100644
--- a/lv2.spec
+++ b/lv2.spec
@@ -11,7 +11,7 @@ License:        ISC
 URL:            http://lv2plug.in
 Source:         http://lv2plug.in/spec/lv2-%{version}.tar.bz2
 
-BuildRequires:  doxygen
+BuildRequires:  doxygen graphviz python-rdflib
 # this package replaces lv2core 
 Provides:       lv2core = 6.0-4
 Obsoletes:      lv2core < 6.0-4