I'm a total newbie to gfortran and need help! I'm running gfortran on an iMac core-2 duo and it usually works well. However, on a particular program it gives /usr/bin/ld: Undefined symbols: __gfortran_internal_free __gfortran_internal_malloc __gfortran_pow_r4_i4 collect2: ld returned 1 exit status How can I fix this?