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Adding this information here for reference: rumour has it that Apple is 
actively thinking of ways to fix the POSIX_C_SOURCE problems (i.e. the 
fact that this define disables some features while enabling others), 
probably through a different define that you can use together with 
POSIX_C_SOURCE to re-enable apple-specific additions or something like 
that.

So, we should keep our eyes open for this.