error compiling COAWST

[clairs256]

I keep getting the below error during the first stage of compiling COAWST. I checked the mpi.h file in the directory I had set during the MCT compile and it didn't have MPI_PROC_NULL so I used #define MPI_PROC_NULL (0). That didn't work. I then copied the mpi.h file from the openmpi module I'm using and that didn't work. Attached are mpi.h (last attempt, copied from module) and mpi_old.h (from the mct compile), coawst.bash and projects.h
coawst.zip

cd ./Build; /apps/openmpi/4.0.2/bin/mpif90 -c -fp-model precise -ip -O3 -traceback -check uni nit -I/home/549/cs8275/bin/include -I/home/549/cs8275/COAWST//WRF/main -I/home/549/cs8275/COA WST//WRF/external/esmf_time_f90 -I/home/549/cs8275/COAWST//WRF/frame -I/home/549/cs8275/COAWS T//WRF/share exchange_3d.f90
mp_exchange.f90(106): error #6404: This name does not have a type, and must have an explicit type. [MPI_PROC_NULL]
Null_Value=MPI_PROC_NULL
-----------------^
compilation aborted for mp_exchange.f90 (code 1)
make: *** [ROMS/Utility/Module.mk:15: Build/mp_exchange.o] Error 1
make: *** Waiting for unfinished jobs....

Thanks

[jcwarner-usgs]

this may not be the best solution, but edit
ROMS/Utility/mp_exchange.F
and change lines 113-117 from

if defined MPI

  Null_Value=MPI_PROC_NULL

else

  Null_Value=-1

endif

to
!# if defined MPI
! Null_Value=MPI_PROC_NULL
!# else
Null_Value=-1
!# endif

and see if that compiles. So older versions of mpif.h do not have mpi_proc_null defined.
-j

[clairs256]

Thanks John looks like it fixed that error