I can't bind data in prepared statement

[walcapu]

Hi,
I'm trying to insert data using prepared statements in my C application
because I need to store binary data.
Unfortunately mysql_stmt_bind_param() fails issuing this error:
"Using unsupported buffer type: 1238604 (parameter: 3)"
I also tried to execute exactly the same example provided in
"24.2.7.10. mysql_stmt_execute()" (mysql site)
but it still fails giving tha same error.

I'm using MySQL 5.1 and the client (my application) is compiled and executed on the the same machine.

Whitch components of mysql I have to install to process
prepared statements ?
I have to download some patches for libraries, includes etc ?

Can anyone help me, please ?

Walter