While Mac OS X is unix underneath, Apple are not open-source friendly. They have not updated gcc in about 5 years, and even though they now provide clang, they

While Mac OS X is unix underneath, Apple are not open-source friendly. They have not updated gcc in about 5 years, and even though they now provide clang, they still provide no C++0x support, unlike linux and windows. The various package managers (brew, ports, fink) seem to often brake, and have packages broken for months.