Custom engine build - which files should I distribute?

So I have currently built version 4.7.6 from the source on github, and I would like to share that build with other members of the team, so that we all have exactly the same version. For now I haven’t modified any of the source but I may down the track.

My questions is, which directories or files in the directory do I need to share so that others can copy it into their main Unreal Engine directory (with all of their other engine versions) and have it run? I would copy the whole directory, but it seems a bit of overkill.

For example the engine versions i’ve downloaded from Epic are around 10gb. My custom engine dir is 36gb! What can I safely ignore before I distribute it?