-#PARALLEL_DIRS:= $(patsubst %/Makefile,%,$(wildcard $(SourceDir)/*/Makefile))
-PARALLEL_DIRS:= Fibonacci HowToUseJIT ModuleMaker
+PARALLEL_DIRS:= BrainF Fibonacci HowToUseJIT ModuleMaker
+
+ifeq ($(HAVE_PTHREAD),1)
+PARALLEL_DIRS += ParallelJIT
+endif