I actually had to set FCFLAGS, not LDFLAGS, to get arbitrary flags passed down to the Fortran tests in configure.
Can you try that?  (I'm not 100% sure -- you may need to specify LDFLAGS *and* FCFLAGS...?)
We have made substantial improvements to the configure tests with regards to the MPI F90 bindings in the upcoming 1.1 release.  Most of the work is currently off in a temporary branch in our code repository (meaning that it doesn't show up yet in the nightly trunk tarballs), but it will hopefully be brought back to the trunk soon.

From: users-bounces@open-mpi.org [mailto:users-bounces@open-mpi.org] On Behalf Of Terry Reeves
Sent: Wednesday, May 24, 2006 4:21 PM
To: users@open-mpi.org
Subject: Re: [OMPI users] Fortran support not installing

Unfortunately using  lSystemStubs still failed during configure. Output enclosed