diff --git a/SConstruct b/SConstruct
index 1a7864ee7..4b7e96c8b 100644
--- a/SConstruct
+++ b/SConstruct
@@ -715,6 +715,8 @@ if not preconfigured:
 
     env['MISSING_DEPS'] = []
     env['SKIPPED_DEPS'] = []
+    env['HAS_CAIRO'] = False
+    env['HAS_PYCAIRO'] = False
     
     env['LIBDIR_SCHEMA'] = LIBDIR_SCHEMA
     env['PLUGINS'] = PLUGINS