As far as I know Omake looked into the network and tried to find compiled artifacts of the same configuration to avoid recompiling. That was very important when limited client performance drove build times.

RTC SCM does not have something like Omake. You would use the build tools available for your language e.g. make, gmake or whatever. I am not sure if there are systems out there that help with avoiding builds. There are solutions for specific systems such as host systems (z). Unfortunately this can be a very language dependent feature and I don't think there is a solution that works across all languages.