Just tried to build Postgres 17 on AIX

Apparently I missed the memo that support for AIX was being dropped in Postgres 17.

When attempting to build 17.1 on AIX today I got this message:

checking build system type... powerpc-ibm-aix7.1.3.0
configure: error:
*******************************************************************
PostgreSQL has apparently not been ported to your platform yet.
To try a manual configuration, look into the src/template directory
for a similar platform and use the '--with-template=' option.

Please also contact <pgsql-bugs(at)lists(dot)postgresql(dot)org> to see about
rectifying this. Include the above 'checking host system type...'
line.
*******************************************************************

Is manual configuration an option or are we just out of luck as far as Postgres 17 on AIX?

Thanks, Mark