DocBook detection in autoconf is against an old version; patch enclosed

[dankna]

Running ./configure on a stock 7.0.0.20101026 snapshot reports:

checking for DocBook DTD... I/O error : Attempt to load network entity http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd
conftest.xml:5: warning: failed to load external entity "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
]>
  ^
conftest.xml:6: element book: validity error : No declaration for attribute id of element book
<book id="test">
               ^
conftest-book.xml:2: parser error : Entity 'ldquo' not defined
  <title>A DocBook &ldquo;Test Document&rdquo;</title>
                          ^
conftest-book.xml:2: parser error : Entity 'rdquo' not defined
  <title>A DocBook &ldquo;Test Document&rdquo;</title>
                                              ^
conftest-book.xml:11: parser error : chunk is not well balanced

^
conftest.xml:7: parser error : Failure to process entity conftest-book
&conftest-book;
               ^
conftest.xml:7: parser error : Entity 'conftest-book' not defined
&conftest-book;
               ^
failed
configure: WARNING: cannot find a DTD for DocBook XML V4.2, you will not be able to validate your documentation
configure: WARNING: check your XML_CATALOG_FILES environment variable and/or /etc/xml/catalog
checking for xsltproc... /usr/local/bin/xsltproc
checking for DocBook XSL stylesheet... no
configure: WARNING: cannot find DocBook XSL stylesheets, you will not be able to build the documentation

But this is erroneous because I have laboriously installed DocBook?'s XSL many times. I traced the problem to the fact that autoconf was checking specifically for version 4.2, and I have installed version 4.5, which is the latest as of this writing. Bumping the version numbers in aclocal.m4 and running autoreconf fixed the problem. Patch attached.

[dankna]

diff-format patch against aclocal.m4 in the root of the snapshot tree

[igloo]

The docbook-xml package in Debian stable looks like it includes schemas for all versions from 4.0 through 4.5.

Should check what versions we have easily available on Windows and OS X before upping the version.

[igloo]

OS X looks fine:

$ ls /opt/local/share/xml/docbook/
4.1.2   4.2     4.3     4.4     4.5     5.0

[igloo]

And cygwin too:

$ ls -d /usr/share/sgml/docbook/xml*
/usr/share/sgml/docbook/xml-dtd-4.1.2  /usr/share/sgml/docbook/xml-dtd-4.4
/usr/share/sgml/docbook/xml-dtd-4.2    /usr/share/sgml/docbook/xml-dtd-4.5
/usr/share/sgml/docbook/xml-dtd-4.3

[igloo]

Fixed by:

Sun Nov 14 15:50:23 GMT 2010  Ian Lynagh <igloo@earth.li>
  * Update to docbook 4.5; fixes trac #4447