Datatypes in embedded SQL

Hey all.

I've a question on embedded sql.
Thing is, I'm trying to declare a struct in the embedded SQL part in my C
program, but the preprocessor complains about an 'unknown data type in line
162'. Is it not possible at all in Postgres to declare a structure? I tried
writing out the DBstruct in the SQL DECLARE section, that didn't work
either.
When i don't use the struct, passing 4 variables instead, all goes well.

I Am using Postgres server 7.0.2, and the pgcl preprocessor, running under
Mandrake Linux.

Regards,
Mic

preveously defined:

typedef struct {
int line_nr,
type;
char nick[10],
line[161];
} DBstruct;

/* ------------------------------------------------------DBinsRecord--------
does : Inserts a line in the db
args :
return : error code (0 = ok)
---------------------------------------------------------------------------
*/
static int DBinsRecord (
DBstruct *Values
)
{
EXEC SQL BEGIN DECLARE SECTION;
DBstruct *pRec = Values;
EXEC SQL END DECLARE SECTION;

EXEC SQL
INSERT INTO channel
(line_nr
,nick
,type
,line)
VALUES
( :pRec->line_nr
, :pRec->nick
, :pRec->type
, :pRec->line);

return (sqlca.sqlcode);
}