/usr/lib/openmpi/include/mpif-ext.h is in libopenmpi-dev 1.10.2-8ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | ! -*- fortran -*-
! $HEADER$
!
! *** THIS FILE IS AUTOMATICALLY GENERATED!
! *** Any manual edits will be lost!
!
integer OMPI_HAVE_MPI_EXT
parameter (OMPI_HAVE_MPI_EXT=1)
!
!
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