> I am on Snow Leopard, and I have no trouble using unistd.h which is marked as flawed on the graph. The whole row for `unistd.h` is green (except for MSVC, of

> I am on Snow Leopard, and I have no trouble using unistd.h which is marked as flawed on the graph. The whole row for `unistd.h` is green (except for MSVC, of course) -- why would you think it's flawed on OS X?