BUG #4174: ECPG refuses datestyle SQL

The following bug has been logged online:

Bug reference:      4174
Logged by:          Francisco Leovey
Email address:      fleovey@jus.gov.ar
PostgreSQL version: 8.3.1
Operating system:   SuSE Linux 9.2
Description:        ECPG  refuses datestyle SQL
Details:

if you write
EXEC SQL SET datestyle TO SQL, DMY;
 you get   ERROR: syntax error at or near "SQL"

But
EXEC SQL SET datestyle TO Postgres, DMY;
 works fine