Question in make check of qa_howto*.py

Dear all,

I am reading over the manual of how-to-write-a-block. For the given
example:
howto_square_ff. I followed the instructions to run the test driven
program,
but after I input “$ make check” under directory
~/gr-howto-write-a-block/src/python, it said:
“make: *** No rule to make target `check’. Stop.”
which is not the same as the expected messages in tutorial, i.e -

[eb@bufo python]$ make check
make check-TESTS
make[1]: Entering directory
`/home/eb/gr-build/gr-howto-write-a-block/src/python’
Traceback (most recent call last):
File “./qa_howto.py”, line 24, in ?
import howto
ImportError: No module named howto

I know I have to import “howto” module to make the thing works. But I
was
wondering why I can not even use “make check”? I searched my question
online, but there’s only one similar question which was left unanswered.
What’s the problem might be?

FYI:
Ubuntu9.04 + gnuradio3.2+ gr-howto-write-a-block-3.2.2

Milo