[XFree86] command for recompilation of xfree (compiling only the changed file) ??

[vishnuvaradan vishnuvaradan]

Hi

Can you Please tell me wht the command in xfree to recompile the whole
source (if any change is made only in video driver) ?
Iam giving make World ... its starting from first...

I need to compile only the changed file .. plzz xfree users tell me the
command...