title: Why _PROTOTYPE is used header files
body: <p>Why do we use _PROTOTYPE e.g. _PROTOTYPE( void *memset, (void *_s, int _c, size_t _n) I saw it in <a href="http://www.minix3.org/doc/AppendixB.html" rel="nofollow noreferrer">MINIX3 source code</a></p>