Are you building it on Windows? MPICH 3 series does not support Windows. Try Microsoft MPI : https://docs.microsoft.com/en-us/message-passing-interface/microsoft-mpi

-- 
Hui Zhou

From: Mbaabu Brian via discuss <discuss@mpich.org>
Reply-To: "discuss@mpich.org" <discuss@mpich.org>
Date: Saturday, April 4, 2020 at 8:42 AM
To: "discuss@mpich.org" <discuss@mpich.org>
Cc: Mbaabu Brian <mbaabubrian@gmail.com>
Subject: [mpich-discuss] MPICH INSTALLATION ERRORS

Hello,

My installation produced such errors as are documented in the attached log files.

Please help me resolve them.