- Change the '-' prefixes on Makefile.in commands to '@'.  We only want
  to avoid echoing the commands, not keep on trucking past build
  errors.

- Find/build XInclude-aware automatic Makefile dependency generator.  At
  worst, this shouldn't be much more than a bit of shell and sed.

- Cygwin API docs update:

  - Either:

    - Convert existing SGML code embedded in Cygwin source code
      to Doxygen format, then set up HTML and PDF reference manual
      generation in doc/Makefile.in.  Then, remove vestiges of doctool.

      The Cygwin User Manual reportedly references pieces of the
      current SGML that makes up the API Manual, which if true means
      we have a challenge to make the Doxygen process continue to feed
      the user manual.

    - Or, move all SGML from winsup/cygwin into winsup/doc/api.

  - Current POSIX documentation is nonexistent.  Either:

    - Fork the current POSIX/Linux manpages.  Downside of this is that
      it's in nroff format and the license demands that nroff sources
      continue to be made available.  This is a challenge for PDF
      manual integration.

    - Switch to Doxygen, which lets us have skeletal POSIX docs almost
      for free.  Each can point to web docs for more complete info, such
      that the Cygwin man pages only need to provide parameter lists and
      document Cygwinisms in the implementation.

    - Write our own man pages in DocBook <refentry> form.  Such files
      should be XInclude-able in regular API/user manuals, and only have
      to have the same mininal info as in the Doxygen case above.  It
      just requires a more verbose markup format.

- Remove autotools outputs from repo.  (configure, Makefile, etc.)
  Create a bootstrap script to generate them.  Make sure top-level
  "make" process knows how to call the bootstrap script at need.

- There are absolute HTTP <ulinks> which should be transformed to
  relative links so that they do the right thing when you move the docs
  around.  Maybe they'll never live somewhere else on cygwin.com, but if
  nothing else, they currently do the wrong thing when you open one of the
  generated .html files from the local filesystem: hyperlinks take you off
  to cygwin.com instead of to the relevant local file.

- Convert remaining code snippets from HTML entity form (&amp;,
  &lt;...)  to raw C/C++ code in CDATA sections.  Easier to read and
  edit in XML form.

- Pretty code snippets.  Search for a DocBook aware automatic code
  formatter that will take raw example code in and mark it up, as exists
  for HTML.  If one can't be found or created -- e.g. by lashing an HTML
  code formatter to a sed script then whipping them until they sing -- do
  the markup by hand.

- Move to DocBook 5.

- Files are often named with less detail than the ID of the top-level
  XML element it contains.  For example, specialnames.xml contains
  <sect1 id="using-specialnames">.  The ID scheme seems hierarchical, so
  maybe the files should go into subdirectories; e.g.
  using/specialnames.xml. This would help with the proliferation of files
  this "patch" created.

- "Tidy" the XML files.

- Remove --skip-validation from XMLTO flags variable in Makefile.in,
  then fix any errors and warnings that result.

- Replace the hard-coded dates in <bookinfo><date> tags with DocBook
  time stamps.  (http://www.sagehill.net/docbookxsl/Datetime.html)

- cygwin-ug-net/cygwin-ug-net-nochunks.html.gz build rules can probably
  be reduced to a one-liner by moving from xmlto wrapper to a raw
  xsltproc call.

- Is xmlto pulling its own weight for the HTML case?  It *might* have
  some value for the PDF-via-dblatex case, but an xsltproc call for HTML
  is also a one-liner.

- Switch from xmlto/dblatex to xsltproc/FOP for PDF?  Might be a
  prerequisite to the font changes below if dblatex doesn't allow
  one to specify fonts through the xmlto layer.

- Typography improvements: curl all the quotation marks, replace "--"
  with em dashes, check proper names for missing accents, etc.

- Adapt top-level cygwin.com CSS to DocBook HTML output so the user
  guide blends with the rest of the site.  (Something like this has
  been done to cygwin.com/faq.html already.)

- Improve PDF styling:

  - Wider margins, section indenting, etc.  (i.e. Fix the "wall of text"
    problem.)

  - Current fonts are Business Blah at best.  Most severe to least:

    - Courier for code is just plain ugly, and is apparently a bitmap
      font in some people's PDF output besides.  Switch to Deja Vu,
      Inconsolata, or Adobe Source Code Pro.

    - Times.  Sigh.  There must be something better in the free world,
      something more in the Palatino or Garamond mold.  Bitstream Vera
      Serif?  Linux Libertine?

    - Arial/Helvetica/whatever.  Not a serious issue, but we can do
      better, even if it's just a minor shake-up, like switching to a
      condensed face.