As I noted in my own mention <a href="http:&#x2F;&#x2F;highlandsun.com&#x2F;hyc&#x2F;#Make" rel="nofollow">http:&#x2F;&#x2F;highlandsun.com&#x2F;hyc&#x2F;#Make</a> I originally wrote that patch back in 1991. There was no such thing as threads back then. Even in 1999 the POSIX threads spec was only up to Draft 6 or so, not yet finalized. Nobody sane would write production code for such a moving target (oh, except maybe Microsoft, using Draft4 to create the Windows NT threads API).