Issue opening file on NFS read-only mount

[Bob Apodaca]

I am not certain this is a gfortran issue so feel free to point me in 
the proper direction.

Here's the main issue: I am trying to read a file mounted via a 
read-only NFS mount. This worked in Debian 6 (kernel 2.6.32 using 
gfortran 4.4.5), but fails with Debian 7 (3.2.0-4-686-pae using gfortran 
4.7.2 or gfortran 4.4.7).

Sample code:

       FN = '/mnt/nfs/stuff/stuff/' //
      +  'morestuff/file'
       OPEN (UNIT=7, FILE=FN )
       READ (7, '( A )' , END=50) FILE_LINE
       CLOSE (7)

When I used strace to try to understand this is what I am seeing:

stat64("/mnt/nfs/stuff/stuff/more_stuff/file", {st_mode=S_IFREG|0664, 
st_size=15533, ...}) = 0
open("/mnt/nfs/stuff/stuff/more_stuff/file", O_RDWR|O_CREAT|O_LARGEFILE, 
0666) = -1 EROFS (Read-only file system)
open("/mnt/nfs/stuff/stuff/more_stuff/file", 
O_RDONLY|O_CREAT|O_LARGEFILE, 0666) = -1 ENOTDIR (Not a directory)

When I compile the same code on squeeze, I get:

open("/mnt/nfs/stuff/stuff/more_stuff/file", O_RDWR|O_CREAT|O_LARGEFILE, 
0666) = -1 EROFS (Read-only file system)
open("/mnt/nfs/stuff/stuff/more_stuff/file", 
O_RDONLY|O_CREAT|O_LARGEFILE, 0666) = 3
fstat64(3, {st_mode=S_IFREG|0664, st_size=15533, ...}) = 0

When I run the code compiled on squeeze on a wheezy system, I get the 
same result as code compiled on a wheezy system. This makes me suspect 
gfortran may not be the issue, but I am not sure what the issue could be.

I would appreciate any help or advice.