mrtblt
Did you read the php.ini example ? Based on that try
mkdir -p /etc/e-smith/templates-custom/etc/php.ini
cd /etc/e-smith/templates-custom/etc/php.ini
touch /etc/e-smith/templates-custom/etc/php.ini/50interbase
Edit the fragment and make your required changes (ie whatever you usually put in the wamp php.ini)
pico -w /etc/e-smith/templates-custom/etc/php.ini/50interbase
Save changes and exit (press the following keys together)
Ctrl o
Ctrl x
Expand template and restart httpd-e-smith
expand template /etc/php.ini
sv t /service/httpd-e-smith
Examine /etc/php.ini to see that your changes have been created.
The position of the interbase entry is determined by the numerical name of the fragment eg 90interbase will be further down than 50interbase. You may have to experiment.
To revert your system to normal, delete the 50interbase custom template fragment, expand & restart as shown above