Compilate problems

The problem is identical if I run this example:

#include <postgresql/8.3/server/postgres.h>
#include <postgresql/8.3/server/executor/spi.h>
#include <postgresql/8.3/server/commands/trigger.h>

extern Datum trigf(PG_FUNCTION_ARGS);

PG_FUNCTION_INFO_V1(trigf);

Datum
trigf(PG_FUNCTION_ARGS)
{
TriggerData *trigdata = (TriggerData *) fcinfo->context;
TupleDesc tupdesc;
HeapTuple rettuple;
char *when;
bool checknull = false;
bool isnull;
int ret, i;

/* make sure it's called as a trigger at all */
if (!CALLED_AS_TRIGGER(fcinfo))
elog(ERROR, "trigf: not called by trigger manager");

/* tuple to return to executor */
if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
rettuple = trigdata->tg_newtuple;
else
rettuple = trigdata->tg_trigtuple;

/* check for null values */
if (!TRIGGER_FIRED_BY_DELETE(trigdata->tg_event)
&& TRIGGER_FIRED_BEFORE(trigdata->tg_event))
checknull = true;

if (TRIGGER_FIRED_BEFORE(trigdata->tg_event))
when = "before";
else
when = "after ";

tupdesc = trigdata->tg_relation->rd_att;

/* connect to SPI manager */
if ((ret = SPI_connect()) < 0)
elog(INFO, "trigf (fired %s): SPI_connect returned %d", when, ret);

/* get number of rows in table */
ret = SPI_exec("SELECT count(*) FROM ttest", 0);

if (ret < 0)
elog(NOTICE, "trigf (fired %s): SPI_exec returned %d", when, ret);

/* count(*) returns int8, so be careful to convert */
i = DatumGetInt64(SPI_getbinval(SPI_tuptable->vals[0],
SPI_tuptable->tupdesc,
1,
&isnull));

elog (INFO, "trigf (fired %s): there are %d rows in ttest", when, i);

SPI_finish();

if (checknull)
{
SPI_getbinval(rettuple, tupdesc, 1, &isnull);
if (isnull)
rettuple = NULL;
}

return PointerGetDatum(rettuple);
}