octave fails to detect gcc 3.1's f77 as a compatible compiler:
checking whether g77 is the GNU Fortran compiler... yes
checking g77/f2c compatibility... no
checking for f2c... no
configure: warning: in order to build octave, you must have a compatible
configure: warning: Fortran compiler or f2c installed and in your path.
This might be caused by a g77 bug; please verify and reassign if
gcc bug - it can't even compile the FORTRAN version of "hello, world":
[teg@oslo teg]$ g77 -o hello hello.f
/usr/bin/ld: cannot find -lfrtbegin
collect2: ld returned 1 exit status
Created attachment 37522 [details]
"hello, world" - the FORTRAN way
Fixed in my gcc31.spec copy, will be in gcc-g77-3.1-0.8.