login1$ uname -a Linux login1.pads.ci.uchicago.edu 2.6.18-164.11.1.el5 #1 SMP Wed Jan 6 13:26:04 EST 2010 x86_64 x86_64 x86_64 GNU/Linux login1$ uname -m x86_64 login1$ cat /etc/issue Red Hat Enterprise Linux Server release 5.4 (Tikanga) Kernel \r on an \m login1$ gcc -version gcc: unrecognized option '-version' gcc: no input files login1$ gcc --version gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-46) Copyright (C) 2006 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. login1$ gfortran --version GNU Fortran (GCC) 4.1.2 20080704 (Red Hat 4.1.2-46) Copyright (C) 2007 Free Software Foundation, Inc. GNU Fortran comes with NO WARRANTY, to the extent permitted by law. You may redistribute copies of GNU Fortran under the terms of the GNU General Public License. For more information about these matters, see the file named COPYING login1$