The following information does not solve the problem, but it may help.

GNU Pthread is not installed on Mac OS X, by default.

To install it, the name of the Port's package is "pth".

sudo port install pth

Now, you have to modify the configure script of POVRAY, if you want it to detect
GNU Pthread.

Line 6858: Add the tags "pth" and '-pth"

acx_pthread_flags="pth -lpth pthreads none -Kthread -kthread lthread -pthread
-pthreads -mthreads pthread --thread-safe -mt pthread-config"

Best regards,

Denis

NOTE:

MacBook-Pro-de-Denis:povray-3.7.0.RC6 denisbeurive$ machine
i486

MacBook-Pro-de-Denis:povray-3.7.0.RC6 denisbeurive$ sw_vers
ProductName:    Mac OS X
ProductVersion: 10.7.5
BuildVersion:     11G63

gcc -v
....
Target: i686-apple-darwin11
....
Thread model: posix
gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)

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