jom: file name macro modifers do not work for $?

testDep: foo1.cpp
	@echo $?
	@echo $**

$? is not working. But $** works.

I checked the source code, around line 320 to 350 of makefile.cpp.
It filtered out the foo1.cpp by timestamp test.

I found this when I tried to use jom on Baton 10.