#ifndef PARALLEL_GC
#define scavenge_block(a,b) scavenge_block1(a,b)
#define evacuate(a) evacuate1(a)
+#define recordMutableGen_GC(a,b) recordMutableGen(a,b)
#else
#undef scavenge_block
#undef evacuate
#undef scavenge_block
#undef evacuate
+#undef recordMutableGen_GC