pro*c segmentation fault!!!!!!

Hi,
I am using a make file to compile a pro*C program.I am able to compile and generate the executable.However while I am executing the program I am encountering a segmentation fault.It gives this falut on encountering a EXEC SQL statement.The following is a part of the code that is giving this fault.

memset((char*)username.arr, 0x00, 20);
strcpy((char*)username.arr, "user/pwd");
username.len = strlen((char*)username.arr);

fprintf(stdout, "DEBUG=Connect to database\n");

EXEC SQL CONNECT :username;
if (sqlca.sqlcode != OK) {
fprintf(stderr, "\nUnable to connect - sqlca.sqlcode[%d]\n\n", s
qlca.sqlcode);
exit(NOTOK);
}

Can anyone please help me with this?

Aakhil

How is the program being run?

Is your ORACLE_SID set?