Colorizing a custom language with {Rouge}

Greetings.

Trying to run a project using a specific language, which is not supported by the “Rouge” code highlighter.
As I know, Rouge is extendable, so the question is - how to add a custom language support?

Tried copying the .rb file which is used for C highlighting (“c.rb”), replacing the syntax in it with what I need, but it didn`t work. Is it necessary to additionally initialize it somehow, or something?
Can anyone give some kind of list of actions for this case?

Thanks in advance. Paul.