polyfill copied and pasted from
https://github.com/GNOME/libxml2/commit/1341deac131af51bdd3b4dd124440c198d361cc9
since libxml2 2.14 removed xmlShellPrintNode()

--- a/src/rdrview.c
+++ b/src/rdrview.c
@@ -489,6 +489,31 @@ static void parse_arguments(int argc, char *argv[])
 	}
 }
 
+
+/**
+ * xmlShellPrintNode:
+ * @node : a non-null node to print to the output FILE
+ *
+ * Print node to the output FILE
+ */
+
+static void xmlShellPrintNode(xmlNodePtr node)
+{
+	FILE *fp = stdout;
+
+	if (!node)
+		return;
+
+	if (node->type == XML_DOCUMENT_NODE)
+		xmlDocDump(fp, (xmlDocPtr) node);
+	else if (node->type == XML_ATTRIBUTE_NODE)
+		xmlDebugDumpAttrList(fp, (xmlAttrPtr) node, 0);
+	else
+		xmlElemDump(fp, node->doc, node);
+
+	fprintf(fp, "\n");
+}
+
 /**
  * Save the HTML for a node to the given file
  */