How to reset sys.exec_prefix?

[Bryan]

Somehow on my linux box I scrood things up and I lost my python path info.

If I check sys.exec_prefix or sys.prefix it shows '/usr/local/', where 
it should show '/usr/'.

Is there a config file somewhere that I can change to fix this, or do I 
need to do a rebuild/reinstall?  Hope not.

Thanks,
B