Was this to do with installing a standalone GBC emulator? Which one out of interest?
If you’re using Clockwork OS 0.4, if has most of them installed already.
Standalone emulators don’t have the same interface as ones that use Retroarch. This makes them run faster in some cases. They’re entirely there so you have a choice of different emulators to use.
Another thing I want to point out is that this thread is half a year old, and a lot of the information is outdated, eg the file structure.
Have a look at this thread for something similar, but more up to date. This is if you want to use Clockwork OS 0.3.