=== modified file 'stagebuilder.prolog'
--- stagebuilder.prolog	2011-11-16 18:12:20 +0000
+++ stagebuilder.prolog	2011-11-16 17:38:01 +0000
@@ -346,7 +346,7 @@
 % USE handling
 
 gentoo_package_use(Name, UseEnabledSet, UseDisabledSet) :-
-    gentoo_package(Name,_Echos, UseEnabledList, UseDisabledList),
+    gentoo_package(Name,_Echos, UseEnabledList, UseEnabledSet),
     list_to_ord_set(UseEnabledList, UseEnabledSet),
     list_to_ord_set(UseDisabledList, UseDisabledSet).