Sorrry to bother you, but I am trying to get gfortran going on my macbook running EL CAPITAN. I haven't graduated beyond f77, so I wrote an extremely simply test program, which just sums integers from 1 to 100. When I try to compile, using gfortran -o test test.f or similar command, I get the following error message: undefined symbols for architecture x86_64. "start" references from -u command line option Can you help? Dan Purrington
