How to change the order of default "Source Lookup Path" entries globally for shared eclipse

How to change the order of default "Source Lookup Path" entries globally
for shared eclipse

We have installed Eclipse CDT (Juno SR2) in a shared environment on SUSE
Linux server.
Our users requested to change the order of "Source Lookup Path" entries
globally so that this change can be applicable to everyone.
For example, Click on Window --> Preferences --> C/C++ --> Debug -->
Source Lookup Path.
Currently the default order is:
Absolute File Path
Program Relative Path
Project
We want to change the order as follows:
Project
Program Relative Path
Absolute File Path
How to make these changes globally?
Under which location, these entries will be stored?