Unfortunately there is no option to disable real128 or complex128 at the moment. You can remove them by editing src/binding/fortran/use_mpi_f08/mpi_f08_types.f90, search for “real128” and “complex128”, remove the lines declaring them as well as the two subroutines below. -- Hui Zhou From: Blaise A Bourdin via discuss <[email protected]> Date: Sunday, March 7, 2021 at 7:15 AM To: [email protected] <[email protected]> Cc: Blaise A Bourdin <[email protected]> Subject: [mpich-discuss] Build failure on macOS Big Sur arm64 So it looks like in this case, the f08 bindings for real128 and complex128 are created even though they shouldn’t. I was not able to figure out how to disable their creation during the configure stage. Can somebody help? My config.log is attached.