Okay this is scary but it is just adding a configure option to disable

* HTMLtree.c SAX2.c c14n.c catalog.c configure.in debugXML.c
  encoding.c entities.c nanoftp.c nanohttp.c parser.c relaxng.c
  testAutomata.c testC14N.c testHTML.c testRegexp.c testRelax.c
  testSchemas.c testXPath.c threads.c tree.c valid.c xmlIO.c
  xmlcatalog.c xmllint.c xmlmemory.c xmlreader.c xmlschemas.c
  example/gjobread.c include/libxml/HTMLtree.h include/libxml/c14n.h
  include/libxml/catalog.h include/libxml/debugXML.h
  include/libxml/entities.h include/libxml/nanohttp.h
  include/libxml/relaxng.h include/libxml/tree.h
  include/libxml/valid.h include/libxml/xmlIO.h
  include/libxml/xmlschemas.h include/libxml/xmlversion.h.in
  include/libxml/xpathInternals.h python/libxml.c:
  Okay this is scary but it is just adding a configure option
  to disable output, this touches most of the files.
Daniel
diff --git a/include/libxml/xpathInternals.h b/include/libxml/xpathInternals.h
index d74b9dd..6b9e996 100644
--- a/include/libxml/xpathInternals.h
+++ b/include/libxml/xpathInternals.h
@@ -377,6 +377,7 @@
 				 int line,
 				 int no);
 
+#ifdef LIBXML_DEBUG_ENABLED
 XMLPUBFUN void XMLCALL		
 		xmlXPathDebugDumpObject	(FILE *output,
 					 xmlXPathObjectPtr cur,
@@ -385,7 +386,7 @@
 	    xmlXPathDebugDumpCompExpr(FILE *output,
 					 xmlXPathCompExprPtr comp,
 					 int depth);
-
+#endif
 /**
  * NodeSet handling.
  */