Found a weird problem: ¿bug?

Hello!

I have a table with this structure (excerpt):

carrusel=> \d wrk_data
Table    = wrk_data
+------------------------+--------------------------+-------+
|  Field                 |           Type           | Length|
+------------------------+--------------------------+-------+
...
| reintentos             | int4 default 0           |     4 |
| bloq_hasta             | timestamp default 'now'  |     4 |
+------------------------+--------------------------+-------+


If, using tclsh + libpgtcl.so I do:


-----------------

pgomez@darkstar:/home/pgomez > tclsh % load
/usr/local/pgsql/lib/libpgtcl.so

% set db [pg_connect carrusel]

% pg_exec $db "update wrk_data set reintentos=0,bloq_hasta = bloq_hasta
+ '30 minute'"
pgsql3.0

----------------

It works fine. But if I do the same throug psql:


carrusel=> update wrk_data set reintentos=0,bloq_hasta=bloq_hasta+'30
minutes';

ERROR:  No such function 'datetime_stamp' with the specified
attributes


Is this a bug? I was trying to program a pl/tcl function and it behaves
like psql, no tcl+libpgtcl :-(

Any idea?

Saludos,
Pablo GOMEZ