[exim-dev] release builds

OK, following http://wiki.exim.org/EximRelease
I'm trying to run the mk_exim_release.pl script.

This is on an SL6 system (another RHEL clone).

I located "xfpt" at https://github.com/nigelm/xfpt
and "sdop" from http://freecode.com/projects/sdop
and I had to add "xmlto" (which yum had a package for).

Now I'm stumped by:

xsl:import : unable to load /usr/share/xml/docbook/stylesheet/nwalsh/1.71.1/xhtml/docbook.xsl


Any clues, anyone?

-- 
Thanks,
    Jeremy