patch files help

[invinciblegod]

I found a patch for doom for the sansa and I dont know how to apply it. Am i suppsoed to compile something or replace a file or what? any help is appreciated. this is the file:
http://www.rockbox.org/tracker/task/6467

[scorche]

http://www.rockbox.org/twiki/bin/view/Main/SimpleGuideToCompiling will tell you what you need to do.

Also, next time search the wiki/forums for your question.  It has been answered many times.