For cgkit-2.0.0alpha7 under OS X, I installed boost using macports (www.macports.org) using the command line: sudo port install boost +python. (+python is required in order to install the python extensions to boost)
Then, in order to get cgkit's setup.py to recognize the installed Boost, I had to add the following to config.cfg:
INC_DIRS += ['/opt/local/include/boost-1_33_1']
LIB_DIRS += ['/opt/local/lib']
(Paths appropriate to default Macports, but milage will vary with Fink, etc.)
It might be useful to add notes about this to the OS X build information, since the scons build scripts report that Boost is successfully installed for supportlib, but setup.py then fails.