I have forgotten some of the tricks of porting to weird stuff that I used to know when I was working on Blue Gene.

Can someone help me figure out how to configure for an unknown tuple?  I am failing to find the answer myself.

Thanks,

Jeff

jhammond@cfarm240:~/mpich/build$ ../configure CC=clang --disable-fortran --disable-long-double --enable-g=all
Configuring MPICH version 4.2a1 with  'CC=clang' '--disable-fortran' '--disable-long-double' '--enable-g=all'
Running on system: FreeBSD cfarm240.cfarm.net 14.0-CURRENT FreeBSD 14.0-CURRENT #0 772f8fd8123: Mon Aug  7 19:39:52 UTC 2023     jenkins@ctsrd-build-linux-j1:/local/scratch/jenkins/workspace/CheriBSD-pipeline_releng_22.12@2/cheribsd-morello-purecap-build/local/scratch/jenkins/workspace/CheriBSD-pipeline_releng_22.12@2/cheribsd/arm64.aarch64c/sys/GENERIC-MORELLO arm64
checking build system type... Invalid configuration `aarch64c-unknown-freebsd14.0': machine `aarch64c-unknown' not recognized
configure: error: /bin/sh ../confdb/config.sub aarch64c-unknown-freebsd14.0 failed

jhammond@cfarm240:~/mpich/build$ clang --version
clang version 13.0.0
Target: aarch64-unknown-freebsd14.0
Thread model: posix
InstalledDir: /usr/local64/llvm-morello/bin
--