[boost] Can't build docs in downloaded Boost 1.66 sources

Subject: [boost] Can't build docs in downloaded Boost 1.66 sources
From: Zach Laine (whatwasthataddress_at_[hidden])
Date: 2018-02-15 05:37:29

I came across this while trying to build the Yap docs, outside the Boost
source tree.  It turns out it doesn't work in the Boost source tree
either.  This:

cd ~/boost_1_66_0
./bootstrap.sh
cd libs/units/doc
~/boost_1_66_0/b2

used to work (not sure how long ago).  Now it says this:

tzlaine_at_linux-desk:~/boost_1_66_0/libs/units/doc$ ~/boost_1_66_0/b2
Performing configuration checks

   - 32-bit                   : no  (cached)
   - 64-bit                   : yes (cached)
   - arm                      : no  (cached)
   - mips1                    : no  (cached)
   - power                    : no  (cached)
   - sparc                    : no  (cached)
   - x86                      : yes (cached)
   - symlinks supported       : yes (cached)
BoostBook warning: no DocBook XSL directory specified.
 If you have the DocBook XSL stylesheets installed, please
 set DOCBOOK_XSL_DIR to the stylesheet directory on either
 the command line (via -sDOCBOOK_XSL_DIR=...) or in a
 Boost.Jam configuration file. The DocBook XSL stylesheets
 are available here: http://docbook.sourceforge.net/
 Stylesheets will be downloaded on-the-fly (very slow!)
...patience...
...patience...
...patience...
...found 2671 targets...
...updating 2 targets...
xslt-xsltproc
../../../bin.v2/libs/units/doc/gcc-gnu-7/debug/threadapi-pthread/units.docbook

http://docbook.sourceforge.net/release/xsl/current/common/common.xsl:1:
parser error : Start ta
g expected, '<' not found
Project web is currently offline pending the final migration of its data to
our
^
compilation error: file
/home/tzlaine/boost_1_66_0/tools/boostbook/xsl/docbook.xsl line 12 elem
ent import
xsl:import : unable to load
http://docbook.sourceforge.net/release/xsl/current/common/common.xs
l

   XML_CATALOG_FILES="../../../bin.v2/boostbook_catalog.xml"
export XML_CATALOG_FILES
"xsltproc" --stringparam boost.defaults "Boost" --stringparam boost.root
"../../../.." --strin
gparam chunk.section.depth "8" --stringparam toc.max.depth "1"
--stringparam toc.section.depth
"8" --xinclude -o
"../../../bin.v2/libs/units/doc/gcc-gnu-7/debug/threadapi-pthread/units.docbo
ok" "/home/tzlaine/boost_1_66_0/tools/boostbook/xsl/docbook.xsl"
"../../../bin.v2/libs/units/do
c/gcc-gnu-7/debug/threadapi-pthread/units.xml"

...failed xslt-xsltproc
../../../bin.v2/libs/units/doc/gcc-gnu-7/debug/threadapi-pthread/units.
docbook...
...skipped <phtml>standalone_HTML.manifest for lack of
<p../../../bin.v2/libs/units/doc/gcc-gnu
-7/debug/threadapi-pthread>units.docbook...
...failed updating 1 target...
...skipped 1 target...

That's the full output from doing the build a second time, FWIW.  Some of
the steps the first time said the same thing, but it seemed too much to
post.

Anyone know what's doing on?

Zach