You can enable Font Lock mode in any major mode automatically by turning on in
the major mode's hook. For example, put in your ~/.emacs:
- (add-hook 'c-mode-hook 'turn-on-font-lock)
+ (add-hook \\='c-mode-hook \\='turn-on-font-lock)
Alternatively, you can use Global Font Lock mode to automagically turn on Font
Lock mode in buffers whose major mode supports it and whose major mode is one