Index: src/GenPoly/InstantiateGeneric.cc
===================================================================
--- src/GenPoly/InstantiateGeneric.cc	(revision 1d776fdacfdd4e1c1e1f7ae9e1b4a6bd650bf24e)
+++ src/GenPoly/InstantiateGeneric.cc	(revision a493682c6f60f330bbd63c42c5956da658ce185f)
@@ -171,5 +171,5 @@
 		Type* postmutate( UnionInstType *inst );
 
-		void premutate( FunctionType * ftype ) {
+		void premutate( __attribute__((unused)) FunctionType * ftype ) {
 			GuardValue( inFunctionType );
 			inFunctionType = true;