This file explains how to compile the NCEP BUFRLIB software, which is
described in detail at http://www.nco.ncep.noaa.gov/sib/decoders/BUFRLIB/,
and whose usage is governed by the terms and conditions of the disclaimer
http://www.nws.noaa.gov/disclaimer.html

The NCEP BUFRLIB software has been compiled and tested across a wide variety
of UNIX platforms, including AIX, HP-UX, IRIX, SunOS and Linux; thus, it
should port with minimal difficulty to any UNIX system by following the steps
below:

1)  Define two environment variables on the local machine:

	$FC to point to the local FORTRAN compiler

	$CC to point to the local C compiler

2)  Run the script "preproc.sh" to pre-process all of the "*.F" files on the
    local machine.  Once this is done, each such file should now have a "*.f"
    counterpart.

    Note that on some systems, most notably Linux, it may be necessary to
    include the "-traditional-cpp" option when calling the cpp program from
    within "preproc.sh".  If problems are encountered during the following
    compile step relating to misaligned white space in some of the source
    files, try editing a copy of "preproc.sh" to add the "-traditional-cpp"
    option in the call to cpp, then repeat steps 2) and 3) again to see if
    that solves the problem.

3)  The source code itself can normally be compiled using:

	$FC -c *.f

	$CC -c *.c

    However, note that the option "-DUNDERSCORE" should be added to the second
    of these two commands if the local FORTRAN compiler appends an underscore
    character to subprogram names in its object namespace.  In such cases,
    specifying "-DUNDERSCORE" to the C compiler will append a matching
    underscore character to any C references to the same subprogram names,
    thereby allowing the linker to correctly resolve such references across the
    C <-> FORTRAN interface at link time.

    In addition, note that the option "-fno-second-underscore" is normally
    required to be added to the first of the above commands whenever $FC points
    to the GNU g77 or gfortran compilers.

4)  Once compilation has been successfully completed, it is then recommended to
    assemble all of the compiled object files into a single archive library via:

        ar crv $BUFRLIB *.o

    where $BUFRLIB points to the desired pathname for the BUFRLIB archive
    library on the local machine.  This archive library can then be easily
    linked whenever the user's application program is subsequently compiled on
    the same local system.