Wish I could have figured this out myself (I had no issues building pre-1.0 source on my MacBook Air Snow Leopard laptop, but I'm having issues building the latest 1.0 source now.
I'm not doing anything crazy, and cmake actually doesn't complain at all...but once I start the make I get the following error when the library linking occurs:
Linking CXX shared module PyOpenColorIO.so
i686-apple-darwin10-g++-4.2.1: -compatibility_version only allowed with -dynamiclib