Using boost 1.55, Ubuntu 12.04, gcc 4.6

I'm building boost on linux using the lsb sdk. I was getting the failure (paraphrased):

pthread_yield not declared

in libs/thread/src/thread.cpp 513

The documentation for pthread_yield (http://man7.org/linux/man-pages/man3/pthread_yield.3.html) says:

This call is nonstandard, but present on several other systems. Use the standardized sched_yield(2) instead.

If I change boost/config/platform/linux.hpp to define

BOOST_HAS_SCHED_YIELD

instead of

BOOST_HAS_PTHREAD_YIELD

Then sched_yield is used instead and the build finishes properly.

I'm posting this for two reasons:

1. To help others running into the same issue
2. To question whether linux.hpp should be updated officially as I did above
3. If not, why

Thanks,

Rob Conde