Comment 2 for bug 1201893

But, most importantly, note that this is not an essential feature, and actually should not be relied on in production. It conceptually can not be fixed in general (machines with multiple interfaces) and should not be spent effort on. A clear error message instructing user to configure wsrep_node_address variable should be enough.

#error preprocessor macro was added there to enforce explicit handling of every OS, but the OS does not have to be supported, just handled.