get alert : sem_init() failed (78: Function not implemented

Hi All,

I just upgrade freebsd from 8.1 to 9.1. And after that, every time I start Nginx, I'l get below error message:

2013/03/04 09:21:27 [alert] 43757#0: sem_init() failed (78: Function not implemented)
2013/03/04 09:21:27 [alert] 43757#0: sem_init() failed (78: Function not implemented)

This is the only error message I got, does anyone know how can I fix this problem?

Thank

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