Cannot link with libphobos2.a with GCC 6.2 on Ubuntu 16.10

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On Sunday, 16 October 2016 at 20:01:21 UTC, tcak wrote:
> Hmm. As the error message says, I compiled the program by 
> adding "-fPIC", it really has stopped giving error messages. 
> That came to me weird.

Which flag(s) in `src/posix.mak` did you change?