help with programming

hello all,
as (I think) shown on the libpq - C library page of the documentation, I
attempetd to connedt over ssl to a correctly compiled 7.1 database. Here
is the connection portion of my code:

PGconn *conn;

...

/* make a connection to the database */
conn = PQconnectdb( "host=shelob.temple.edu dbname=ldap_backend user=usr requiressl=1");

...

when run, the program dies with the following :

ERROR: Unknown conninfo option 'requiressl'

any help in this matter would be greatly appreciated.

thanks in advance,
--chris hayner