Where is flock() ???

Hi,

I’m trying to port some code to QNX 6.1, however I have a problem when
trying to link the object files.
Despite flock() being described in the documentation as being in libc:

http://qdn.qnx.com/support/docs/neutrino_2.11_en/lib_ref/f/flock.html

The linker reports that flock() cannot be resolved nm /lib/libc.so | grep flock confirms this.
So the question is, where is flock to be found (if at all)?

Any help appreciated.

Regards
Alan Keane
akeane@quadrics.com