I don't know if this is actually a bug or not, but apparently there is
no way to escape the path separator character (typically ?/ on Unix,
?\\ on Windows) in split_external_path. This means that if for some
reason one wanted to put something like packages in a directory named
something like "xemacs:stuff", that would get split into two
directories of a search path in many contexts such as "./configure
Any thoughts, Mike?
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