[Quickbook] No longer able to build the regex docs?

I just updated to latest Quickbook Trunk and I'm no longer able to build the 
regex lib docs, they fail with:

quickbook.quickbook-to-boostbook 
..\..\..\bin.v2\libs\regex\doc\msvc-10.0\debug\threading-multi\regex.xml
Generating Output File: 
..\..\..\bin.v2\libs\regex\doc\msvc-10.0\debug\threading-multi\regex.xml
syntax_perl.qbk:298: warning: in column:4, '\n' is deprecated, pleases use 
'[br]' instead.
syntax_perl.qbk:298: warning: line breaks generate invalid boostbook (will 
onlynote first occurrence).
syntax_perl.qbk:298: warning: in column:10, '\n' is deprecated, pleases use 
'[br]' instead.
Error: Post Processing Failed.

Any ideas?

Thanks, John.