Problem building PNetCDF 1.12.0 with GCC 7.4.0 and OpenMPI-4.0.2

[Carl Ponder]

I'm seeing this error building PNetCDF 1.12.0 with GCC 7.4.0 and 
OpenMPI-4.0.2:

    make[6]: Entering directory
    '/gpfs/fs1/SHARE/Utils/PNetCDF/1.12.0/GCC-7.4.0_OpenMPI-4.0.2/distro/src/drivers/common'
       CC       utf8proc.lo
       CC       mem_alloc.lo
       CC       dtype_decode.lo
    In file included from dtype_decode.c:16:0:
    dtype_decode.c: In function ‘ncmpii_dtype_decode’:
    dtype_decode.c:390:14: error: expected expression before
    ‘_Static_assert’
              case MPI_COMBINER_HVECTOR_INTEGER:
                   ^
    dtype_decode.c:390:14: error: expected expression before
    ‘_Static_assert’
    dtype_decode.c:390:42: error: expected expression before ‘:’ token
              case MPI_COMBINER_HVECTOR_INTEGER:
                                               ^
    dtype_decode.c:396:43: error: expected expression before ‘:’ token
              case MPI_COMBINER_HINDEXED_INTEGER:
                                                ^
    In file included from dtype_decode.c:16:0:
    dtype_decode.c:462:14: error: expected expression before
    ‘_Static_assert’
              case MPI_COMBINER_HVECTOR_INTEGER:
                   ^
    dtype_decode.c:462:14: error: expected expression before
    ‘_Static_assert’
    dtype_decode.c:462:42: error: expected expression before ‘:’ token
              case MPI_COMBINER_HVECTOR_INTEGER:
                                               ^
    In file included from dtype_decode.c:16:0:
    dtype_decode.c:473:14: error: expected expression before
    ‘_Static_assert’
              case MPI_COMBINER_HINDEXED_INTEGER:
                   ^
    dtype_decode.c:473:14: error: expected expression before
    ‘_Static_assert’
    dtype_decode.c:473:43: error: expected expression before ‘:’ token
              case MPI_COMBINER_HINDEXED_INTEGER:
                                                ^
    Makefile:535: recipe for target 'dtype_decode.lo' failed
    make[6]: *** [dtype_decode.lo] Error 1
    make[6]: Leaving directory
    '/gpfs/fs1/SHARE/Utils/PNetCDF/1.12.0/GCC-7.4.0_OpenMPI-4.0.2/distro/src/drivers/common'
    Makefile:452: recipe for target 'all' failed
    make[5]: *** [all] Error 2
    make[5]: Leaving directory
    '/gpfs/fs1/SHARE/Utils/PNetCDF/1.12.0/GCC-7.4.0_OpenMPI-4.0.2/distro/src/drivers/common'
    Makefile:473: recipe for target 'all-recursive' failed
    make[4]: *** [all-recursive] Error 1

There has been some work done on the src/include/config.h file, that 
look like compatibility fixes for OpenMPI 4.0.2.
I'm able to build the same OpenMPI & PNetCDF with the PGI 19.9 compiler 
without any problem.
Do any of you have some settings I can use to get around this?
I don't mind moving up to GCC 9.* if I have to.
Thanks in advance,

                                         Carl


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