Hello,

I've just decided to give Boost.Predef a test drive for the first time and have found a problem using BOOST_OS_UNIX.

See the test snippet here: http://pastebin.com/4dLDAhEV

This is the output I get using both g++ 4.9.0 and clang++ 3.4.2:

BOOST_OS_UNIX: 0
BOOST_OS_LINUX: 1
unix: 1
__unix: 1
_XOPEN_SOURCE: 700
_POSIX_SOURCE: 1

Everything that is defined that should be to make BOOST_OS_UNIX be defined.

I haven't seen this mentioned anywhere before. I guess this a bug? I haven't looked at predef headers yet.

Thanks,
Troy