gpre ignores the parameters -user and -password.
You have to set the environment variables ISC_USER and ISC_PASSWORD.

> gpre -c -n -user SYSDBA -password masterkey -d c:\path\Database.gdb
> insource.sqc outsource.c
>
> Each time, I get an error message;
>
> Your user name and password are not defined. Ask your
> database administrator
> to set up a Firebird login.
>
> Any ideas on where I went wrong?
>