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(kpathsea.info)Filename aliases

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Filename aliases
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  In some circumstances, you may wish to find a file under several
names.  For example, suppose a TeX document was created using a DOS
system and tries to read `longtabl.sty'.  But now it's being run on a
Unix system, and the file has its original name, `longtable.sty'.  The
file won't be found.  You need to give the actual file `longtable.sty'
an alias `longtabl.sty'.

  You can handle this by creating a file `aliases' as a companion to
the `ls-R' for the hierarchy containing the file in question.  (You
must have an `ls-R' for the alias feature to work.)

  The format of `aliases' is simple: two whitespace-separated words per
line; the first is the real name `longtable.sty', and second is the
alias (`longtabl.sty').  These must be base filenames, with no
directory components.  `longtable.sty' must be in the sibling `ls-R'.

  Also, blank lines and lines starting with `%' or `#' are ignored in
`aliases', to allow for comments.

  If a real file `longtabl.sty' exists, it is used regardless of any
aliases.