This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.
Similar in function to LIST_INSERT_AFTER, this will insert a new element into the list before the specified position. If the specified position is NULL, the element is added as the tail of the list.
basic/ can be used by everything cannot use anything outside of basic/ libsystemd/ can use basic/ cannot use shared/ shared/ can use libsystemd/