Okay so I'm trying to do a kernel build from a make file board config and I so I'm trying to do it with three options in that order okay so if the first option fails or the directory doesn't exist it defaults to the second and then with the second directory if it fails or doesn't exist I'm trying to default to the third to a pre-built kernel directory so how would I do that exactly? because it's driving me nuts .. please help me out with this