Hi Jakob, GCC does not normally include the math LIBRARY (libm.a or libm.so), even if you've included the math HEADER (math.h). This practice is fairly common amonst compiler vendors, so GCC is not doing something wonky or strange. You have to include the math LIBRARY by putting -lm (dash ell em) on your GCC link or compile+link line. e.g.: gcc -o myfoo foo.c -lm HTH, --Eljay
