Hey Greg, sorry didn't read your message very carefully--you were inquiring for a friend. Yes, there are very significant syntactical differences between Linux's g77 and any FORTRAN 90 compilers out there. I think that your friend could probably buy a FORTRAN compiler for around $200.00. They should beware though, some of the compilers like NDP FORTRAN have problems linking to gcc generated programs. Of course things could be worse and he/she could have to write in Cobol. I really don't want to know if there are any Cobol compilers for Linux! Jim WB0TFK