(tds.info)Unspecified pieces

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Appendix A Unspecified pieces
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The TDS cannot address the following aspects of a functioning TeX
system:

  1. The location of executable programs: this is too site-dependent
     even to recommend a location, let alone require one. A site may
     place executables outside the `texmf' tree altogether (e.g.,
     `/usr/local/bin'), in a platform-dependent directory within
     `texmf', or elsewhere.

  2. Upgrading packages when new releases are made: we could find no
     way of introducing version specifiers into `texmf' that would do
     more good than harm, or that would be practical for even a
     plurality of installations.

  3. The location of implementation-specific files (e.g., TeX `.fmt'
     files): by their nature, these must be left to the implementor or
     TeX maintainer. See Section Note: Example implementation-specific
     trees.

  4. Precisely when a package or file should be considered "local", and
     where such local files are installed.  See Section Note: Local
     additions for more discussion.

Portable filenames