多线程问题，请高手帮帮忙啊~~~！！

I am calling sem sem_*funcs in my proms,but the linker complains Linker error - undefined reference to `sem_init':<
,my IDE is codeblocks, and I know the solved method to compile it with -lpthreads,but how solve it in codeblocks?

By the way , i am new to linux programming.

My environment:
Kubuntu 10.10
codeblocks 10.05 compiled by myself
gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5)

thx!