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Just to catch you up in what has transpired so far . . . 

Lucid's "goodie" that I have distributed to all comers is called
CREATE-DIRECTORY-IF-NECESSARY.  It merely takes a pathname, and parses
it Unix-style, probing every intermediate subdirectory to ascertain
whether or not they exist, and creating them (via MKDIR) if not.

Since the user's reques isn't specifically to "create a directory
by this name", then this _interface_ will work portably on all sorts
randoms operating systems, including those that even don't have
"directories", since its only purpose is to assure that you won't have 
any unexpected "missing directory" traps.

-- JonL --