The config directory is /usr/openwin/lib/X11/config and it has a whole bunch of files.
The only system config file you should ever change is "site.def".
You're probably looking for how to get Gcc working with Imake. All you have to do is
"HasGcc2 YES", add
"#define HasGcc2ForCplusplus YES"
Do NOT uncomment the "HasCplusplus" section, since you dont have the Sun C++ compiler
Then you should pretty much be all set!
If you ever want to change anything else, grep for something appropriate in the other files, and look at how it is #ifdef'd. Usually, the desired change is as simple as adding
#define SomeCmd /path/to/command
You may have to play a little to determine whether it should go in the
BeforeVendorCF section, or the
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