message: Add debug echos
diff: @@ -57,6 +57,9 @@ endif
  $(RM) $(subst \,/,$*).o
  ifeq ($(OS),Windows_NT)
  ifneq (,$(findstring tbb.dll, $(notdir $(shell where tbb.dll))))
  + @echo $(findstring tbb.dll, $(notdir $(shell where tbb.dll)))
  + @echo $(notdir $(shell where tbb.dll))
  + @echo $(shell where tbb.dll)
  @echo 'Intel TBB is not in PATH.'
  @echo 'Consider calling '
  @echo '$(HELP_MAKE) install-tbb'
  