Ok, ignoring the fact that you claim to have managed to replace the kernel provided in SLE 11 with the very latest version yet are asking in
another post how to install 2.6.32 and also ignoring that you have managed to replace the kernel yet apparently can't figure out how to install a compiler that is included on the DVD of the version of Linux you are using...
gcc is included in SLE. You can search in YaST for the gcc package, select it and install it. Or just run