How do I change/add environmental information about mysql location?

I am using Redhat linux with LAMPP which means that apache, php, mysql and several other products are installed in the '/opt/lampp' directory. After several attempts to install the advokit product it appears that it is attempting to run mysql from '/usr/bin'. Which 'ini' for 'config' file store information about the location of these executables? or is there and environmental variable that I can set?

I could however link a few mysql executables in the /opt/lampp directory to the /usr/bin directory, but really would rather handle this differently.

FlashL