How to detect sierra with macro in 10.12
<p>i want to use <code>#ifdef __MAC_10_12</code> to detect that the current os version is 10.12, but the header file <code>Availability.h</code> doesn't have this define, the highest version for that file is <code>#define __MAC_10_11_4       101104</code></p>

<p>So how can i do this right now?</p>