FreeBSD threading model

I am planning to design a concurrent server where I intend to handle each client using a thread. I am also planning to use posix threads for this purpose. Which threading lib should I link my app.
This is on FreeBSD 6.2. Should it be -lthr or -lpthreads or something else. I need to have 1:1 threading support which means each thread becomes a schedulable entity in the kernel.

thanks
 
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