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/usr/include/mpich/mpiof.h is in libmpich-dev 3.2-6build1.

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! 
!     Copyright (C) 1997 University of Chicago. 
!     See COPYRIGHT notice in top-level directory.
!
! 
!    user include file for Fortran MPI-IO programs 
!
      INTEGER MPI_MODE_RDONLY, MPI_MODE_RDWR, MPI_MODE_WRONLY
      INTEGER MPI_MODE_DELETE_ON_CLOSE, MPI_MODE_UNIQUE_OPEN
      INTEGER MPI_MODE_CREATE, MPI_MODE_EXCL
      INTEGER MPI_MODE_APPEND, MPI_MODE_SEQUENTIAL
      PARAMETER (MPI_MODE_RDONLY=2, MPI_MODE_RDWR=8, MPI_MODE_WRONLY=4)
      PARAMETER (MPI_MODE_CREATE=1, MPI_MODE_DELETE_ON_CLOSE=16)
      PARAMETER (MPI_MODE_UNIQUE_OPEN=32, MPI_MODE_EXCL=64)
      PARAMETER (MPI_MODE_APPEND=128, MPI_MODE_SEQUENTIAL=256)
!
      INTEGER MPI_FILE_NULL
      PARAMETER (MPI_FILE_NULL=0)
!
      INTEGER MPI_MAX_DATAREP_STRING
      PARAMETER (MPI_MAX_DATAREP_STRING=128)
!
      INTEGER MPI_SEEK_SET, MPI_SEEK_CUR, MPI_SEEK_END
      PARAMETER (MPI_SEEK_SET=600, MPI_SEEK_CUR=602, MPI_SEEK_END=604)
!
      INTEGER MPIO_REQUEST_NULL
      PARAMETER (MPIO_REQUEST_NULL=0)
!
      integer*8 MPI_DISPLACEMENT_CURRENT
      PARAMETER (MPI_DISPLACEMENT_CURRENT=-54278278)
!
      INTEGER MPI_OFFSET_KIND
      PARAMETER (MPI_OFFSET_KIND=           8)
!
!
!
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!
!