pg_dump : option --exclude-schema not recognized

Hi all !

I am trying to exclude just one schema of my dump.

pg_dump -N myschema
or
pg_dump --exclude-schema=myschema
both tell me that the option is unknown.

I am using the win32 binary distribution v8.1.4 (pg_dump
--version says 8.1.4 too).

Is this normal ?

Thanks !
--
Arnaud