I'm trying to compile MPlayer on NetBSD but i'm getting an error:

--
Checking for pthread ...
Error: Lib pthread not found (needed by Windows and networking stuff).

Check configure.log if you do not understand why it failed.
--

I saw that NetBSD implements threads on user space. I've installed the
following packages

- mit-pthreads-1.60b6.tgz
- unproven-pthreads-0.17nb3.tgz

but without success.

What's wrong?