Fixed the compile for MacOs.

Hi Devs, I finally managed to get Mac Os to compile, there is common mistakes using c++11 which I tried out with the stdlibc++, but libc++ and c++14 does work. Theres some server main and master issues there so a fix was simple as it still requires cmath as an included library for mac os client to work.

If I need to add anything to this please, let me know.

DJB