language binding error with Fortran: why won't it link to MPI library?

Question

I'm trying to create language bindings for a message passing interface but the compiler can't recognize my reference to the C functions...

I'm currently using gfortran as my compiler on a linux machine... I know the language bindings work, but whenever I try to link them to the mpi library, I get this error:

    /tmp/ccwukrNT.o: In function `MAIN__':
    hello_init.f90:(.text+0x17): undefined reference to `mpi_init'
    collect2: error: ld returned 1 exit status

the commands to compile I am currently using are:

    gfortran -ffree-form foo.f90 ~/dir1/dir2/bar.f90 -o <outfile> -L  
    /home/.fakeroot/lib -I /home/.fakeroot/include/ -lexampi

(exampi is the standard I am currently working on)

As I said, when I use simple hello_world programs and compile all my files manually, this method works, but it fails when I try and link it to a library. Can anyone help me?

here is my current Fortran binding for MPI_Init:

    module mpi_f08

    interface MPI_Init
    subroutine MPI_Init(ierror) bind(C)

    integer, optional, intent(out) :: ierror

    end subroutine MPI_Init
    end interface MPI_Init

    end module mpi_f08

The C function I am using is trivial... it's merely interfacing with PMPI_Init()... In any event, the library linking is the main problem... Yes, I have externalized it from C++.

Here is the simple test program I wrote:

    program hello_init
    use mpi_f08, only : MPI_Init
    implicit none
    integer :: ierror
    ierror = 0
    call MPI_Init(ierror)
    stop
    end program hello_init

I am not too familiar with Fortran... this was given to me as a side project but it's quickly taking up my whole week simultaneously laughs and cries

Thanks!