xilinx sdka error when using lwip library

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I'm trying to create an echo server on spartan 3 A with MicroBlaze using ethernet interface, but when i compile the project i got an undefined reference error. I am using lwip 1.3.0.

I think that i am missing a library but I can't get which one?

The error is:

microblaze_0\libsrc\lwip130_v3_01_a\src/contrib/ports/xilinx/sys_arch.c:347 >undefined reference to `sem_post'

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