base/1 instead of base/template1 initdb result - Mailing list pgsql-admin

I can't find any reports on this problem :
On MacOS X (darwin), the initdb command creates, as the template, the
"base/1" directory
intead of "base/template1". Further databases creation is then possible
but this odd directory
naming prevents correct pg_upgrade operations from Postgres databases
created on Solaris, for instance.

Any hints ? TIA