DOCBOOK-APPS: docbook-xsl 1.51.1 and xsltproc

Hi,

I'm using  xsltproc for  processing DocBook documents.   Since upgrading
from docbook-xsl 1.50 to 1.51.1, here's what I get:

$ xsltproc docbook-xsl-1.51.1/html/docbook.xsl stage-2002.xml > stage-2002.html
Error Undefined namespace prefix
xmlXPathCompiledEval: evaluation failed
xsltproc in free(): warning: chunk is already free
xsltproc in free(): warning: chunk is already free
xsltproc in free(): warning: chunk is already free
xsltproc in free(): warning: chunk is already free
xsltproc in free(): warning: chunk is already free
xsltproc in free(): warning: chunk is already free
xsltproc in free(): warning: chunk is already free
xsltproc in free(): warning: chunk is already free
xsltproc in free(): warning: chunk is already free
xsltproc in free(): warning: chunk is already free

No problem with Saxon.  Any input?
-- 
Jean-Baptiste Quenot
http://caraldi.com/jbq/