[Users] Problem with compiling Einstein Toolkit on Cray system

[L.S. Oswald]

Hello

I'm attempting to install the Einstein Toolkit on Dora, which is a Cray 
system supercomputer. In doing so I came across the following error:

       Configuration script for thorn MPI returned exit code 5
       Error message: 'MPI could not be configured: neither automatic nor 
manual configuration succeeded'

In addition the log stated that:
       No MPI compiler wrapper found beneath MPI_DIR (MPI_DIR = /usr)

I subsequently discovered that it was looking in the wrong place for the 
MPI root directory and that the reason it was looking under /usr instead 
of /opt/cray/mpt/7.3.2/gni/mpich-cray/8.3 was because that was the 
setting in the ubuntu configuration file that I had used when 
configuring SimFactory. On a reattempt therefore I did not use the 
ubuntu.cfg file when configuring SimFactory, and got the following error 
instead:

       Configuring with flesh MPI
         Warning: use of flesh MPI via MPI option is deprecated and 
should be replaced with the thorn ExternalLibraries/MPI and its MPI_DIR 
option
         MPI selected, but no known MPI method - what is 
"/opt/cray/mpt/7.3.2/gni/mpich-cray/8.3" ?

Attempts at altering the Makefile and the config-info file resulted in 
either no change, or more errors.

Please would you be able to advise me on the correct way to specify the 
root directory for MPI?

Many thanks,

Lucy Oswald