You need to fix whatever causes compilation to fail. Hint: the error to fix is typically the first one you see, so before the message from make which tells you nothing useful.
It's perfectly normal that you get command not found for dolphin-emu, because it isn't installed. It isn't installed because Dolphin was not even built in the first place.
It's perfectly normal that you get command not found for dolphin-emu, because it isn't installed. It isn't installed because Dolphin was not even built in the first place.