How to add my own block onto GRC in MAC OS X?

Hi all,
I have been installing gnuradio from Macport on Snow Leopard 10.66.
Installation is fine and dial_tone.py/GRC all run well (despite some
warnings).

When I try to add my own block by normal make commands, the terminal
display no error, but there is no my block in GRC after I add it. I also
notice in some root paths there are only files associated with my block
instead of other default blocks, e.g.,
/usr/local/share/gnuradio/grc/blocks, there are only my block .xml
files.

Is there any difference between adding block in Ubuntu and OS X? I am
not sure where to find the answers.

Thank you. I would appreciate any help.