When centralize-lisp-binaries is true this variable controls whether or not to customize the output directory based on the current user. It can be nil, t or a string. If it is nil (the default), then no additional information will be added to the output directory. If it is t, then the user's name (as taken from the return value of #'user-homedir-pathname) will be included into the centralized path (just before the lisp-implementation directory). Finally, if include-per-user-information is a string, then this string will be included in the output-directory.