Cannot render BLFS but can render LFS

I've got what looks, at least to me, like a very strange problem.
all my git trees, along with notes, backups, list mail and many
other things, sit on my home server. That is running a somewhat old
version of LFS and some of BLFS (sysv).

Summary of problem: in LFS, when trying to build the book 'make'
completes normally.  In BLFS, 'make' fails because its forst step,
'make html' (using xsltproc) fails.

My last fresh build was in October or November (trying xfce with
wayland, now discarded).

It seems that I updated expat to 2.6.3 on 31st October (needed for
updated fetchmail). But after that, I rendered the BLFS book on 19th
November (r12.2-636).

Now, I can still pull and make LFS (r12.2-85 including the changes
from yesterday (Sunday) but I cannot make BLFS for any version.

AFAICS the html: target in the BLFS Makefile has not changed in a
little over 2 years.

I cannot work out how to debug the failure: make V=something only
shows me it is in the xsltproc comand, which ends with status 2.

With a fresh run after 'make clean',
/home/ken/tmp/blfs-html2.xml does not exist, and capturing stderr
only shows:

make: *** [Makefile:162: /home/ken/tmp/blfs-full.xml] Killed

Any ideas, please ?

I know that my versions of libxslt, libxml2 and now expat are rather
old, but I cannot see what is different between LFS and BLFS.

ĸen
-- 
    When it was cold, we used to sit by a candle for warmth.
    If it got really cold we lit it.

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