On Aug 18, 2006, at 4:43 AM, Michael Banck wrote: >> this is good news. The MOPAC 7.x versions seem to be Fortran90 ; >> do you >> have any experience on F90 programs and gcc? > > Ohhh, I'll try to get this going, I had numerous issues with f2c, g77 > etc. due to mopac7 and ghemical over the last few years. The new gfortran project is a F95 compiler and replaces g77, as of version 4.0 and later. The GCC-4.1 release significantly improved gfortran, IMHO. There's also the g95 project: http://g95.sourceforge.net/ Cheers, -Geoff