A look at C++14, part 1

Indeed. Unfortunately, a lot of programmers don't realize they can use pthread locking functions even without linking to libpthread, getting stubs unless something else has loaded libpthread. The total lack of glibc libpthread documentation might explain this :)

(actually, I can't remember if they're stubs or weak symbols. Stubs, I think, so you don't even need to wrap their uses in null checks.)