We could never use gfortran, and other open source compilers were not really great for us either. We used Intel's fortran compiler, and it stood out as a pure g

We could never use gfortran, and other open source compilers were not really great for us either. We used Intel's fortran compiler, and it stood out as a pure gem. At the time it was free for educational/research purposes, which is why we used it, but if we had to pay (I think the license was like $1k/yr) we would have done it in a heartbeat. Our code was entirely FORTRAN 66 and 77, so that may explain why it worked so well for us.