He doesn't need to compile a kernel for that, just Freetype.

Slightly off topic, most people who compile a kernel don't need to - they usually need to add a module, which if it isn't already packaged, is easily compilable on its own. Check RHEL 4's release notes (which show how to create a Makefile for a single module).

The compile love of Linux novices comes from old documentation from before kernel 2.0, when most drivers started being available as modules.