[Boost-users] boost/threads under linux

Goo morning list I try to build a small app using boost/threads under linux with kdevelop. Sadly, I am unable to link against any boost/thread lib. I tried boost/signal for another sample, to find out if a am able to link against boost/signal and it worked. Does anybody know how to do that? And, yes i did the -pthread gcc option. By the way, how do i tell the compiler that i am using multithreading ? Do I have to do that? its gcc 3.3.3