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libstdc++still links tolibm.soon my system (With G++ 4.4.5), but I meant that you shouldn't need the-lmflag to pull it in at all with C code.-lmfor plaingcc. Which modern GCC do you mean?math.hfunctions, and compiled with justgcc source.c. I just tested on an RH5 machine with gcc 4.1.2 and it requires-lm. Time to edit my answer.