--- a/sbsv2/raptor/python/raptor_make.py	Fri Feb 05 20:24:19 2010 +0000
+++ b/sbsv2/raptor/python/raptor_make.py	Sat Feb 06 09:36:43 2010 +0000
@@ -55,7 +55,7 @@
 		else:
 			raise BadMakeEngineException("'%s' does not appear to be a make engine - no settings found for it" % engine)
 
-		if not avar.isChildOf("make_engine", Raptor.cache):
+		if not avar.isDerivedFrom("make_engine", Raptor.cache):
 			raise BadMakeEngineException("'%s' is not a build engine (it's a variant but it does not extend 'make_engine')" % engine)
 					
 		# find the variant and extract the values