In virtually all manpages of MPI_Wailtall and related functions,
including mthe anpages found in open-mpi web site:
there's an error in referencing nonexistent constant
MPI_IGNORE_STATUSES instead of correct MPI_STATUSES_IGNORE.
This happens for example in section Errors of this man page.
The same problem refers to related manpages, e.g. MPI_Waitany etc.
I suggest grepping the sources for MPI_IGNORE_STATUSES and replacing
all its instances with MPI_STATUSES_IGNORE.
This strange error is absolutely common in all versions of MPI man
pages I found in the Internet, see for example