I made the mistake of downloading and installing the latest gfortran compiler for the Mac, without paying attention to the folder label saying Snow Leopard (I am running Leopard 10.5.8, and trusting the web-page, http://gcc.gnu.org/wiki/GFortranBinariesMacOS, which said that the binary should be good for Leopard. It wasn¹t. When I attempted to compile with the new version, I got the following, no matter how gfortran is invoked: cloverm:~/CRESTONE/IAGO/20100201:[9]>gfortran -v dyld: unknown required load command 0x80000022 Trace/BPT trap When I ³sudo rm -r /usr/local/gfortran /usr/local/bin/gfortran² the installation (which the web page says will do an un-installation), I was unable to reload my prior version of the compiler (from 20090321) -- the installer now gives the message ³You cannot install GNU Fortran compiler (gfortran) on this volume. A newer version of this software already exists on this volume.² Even after a re-hash, I still get that message. I seem to be screwed. What is going on? P.S. If you want me to report a bug differently, you need to rewrite your web pages ? I really don¹t want help to edit web pages. Michael Clover Science Applications International Corporation 10260 Campus Point Drive, MS A-1 San Diego, CA 92121 ph: 858-826-5926 fax: 858-826-6584