mysql_init returns NULL

[mysql]

I am attempting to write a C program to access MySQL.  When I run this program, it 
reports that mysql_init() returned NULL, mysql_errno returned zero, and mysql_error 
returned "".
Here is the program:
#include <stdio.h>
#include <mysql/mysql.h>

int main( void )
{
        MYSQL *db;

        db = mysql_init( NULL );
        if (db == NULL);
        {
                fprintf( stderr, "Error: _init() %d '%s'\n",
                        mysql_errno( db ), mysql_error( db ) );
                return 1;
        }
        mysql_close( db );
        return 0;
}

Build command: gcc mysql.c -lmysqlclient
OS: SuSE Linux 9.0
MySQL components installed:
MySQL-devel-4.0.18-0
MySQL-client-4.0.18-0
MySQL-shared-4.0.18-0
MySQL-server-4.0.18-0
MyODBC-3.51.06-1

I have not been able to find any reference to this issue.
I am able to access the server on this system using the "mysql" tool and using 
OpenOffice.  For this reason, I don't figure I am out of memory [the only documented 
error for mysql_init()].

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