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/xmlschemas.c b/xmlschemas.c
index 46f9f4c..2912861 100644
--- a/xmlschemas.c
+++ b/xmlschemas.c
@@ -512,6 +512,7 @@
  * 									*
  ************************************************************************/
 
+#ifdef LIBXML_OUTPUT_ENABLED
 /**
  * xmlSchemaElementDump:
  * @elem:  an element
@@ -741,6 +742,7 @@
     xmlHashScanFull(schema->elemDecl,
 	            (xmlHashScannerFull) xmlSchemaElementDump, output);
 }
+#endif /* LIBXML_OUTPUT_ENABLED */
 
 /************************************************************************
  * 									*