I haven't been able to recompile Centos' default kernel on 4.2, nor on 4.3 on an x86_64
 
The process fails with two different problems:
 
1. 'cannot find -lqt' error
 
2. offset.h.tmp missing
 
Kind of weird not being able to recompile an integral part of the system on a system which is entirely based on recompilation.
 
Based on second hand reports vanila kernel seems to compile o.k., but I don't want to go vanila if I don't have to.