We found that F90 compilers were missing in our fortran 90. Wen we tried to rebuild with the --enable-f90 option it said that the f90 compilers were missing (although they were included in the path variable).
This link provides the solution on how to add the F90 compilers to the env.
http://www-unix.globus.org/mail_archive/mpich-g/2003/09/msg00012.html

