URGENT : ODBC client for Mac ?

My client tells me (after the project is finished) that they haven't got any PC to install the ODBC driver I was
planningto use to connect to the remote Postgres database (on Linux). 
They only have Macs...
Is there anything available to connect from File Maker Pro 4 on a Macintosh to a Postgres Database on Linux over a
dialupIP connection ? 

TIA,

Nicolas Huillard
G.H.S
Directeur Technique
Tél : +33 1 43 21 16 66
Fax : +33 1 56 54 02 18
mailto:nhuillard@ghs.fr
http://www.ghs.fr