Fix build (#204)

Author: msamesch

reference/pcntl/book.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- EN-Revision: ee8d203f9230b0496f6d69cc1237d9ca63475ad7 Maintainer: hholzgra Status: ready -->
+<!-- EN-Revision: fc9cab7d56f91b2fd9b549eaabcbf77f7d66e36f Maintainer: hholzgra Status: ready -->
 <!-- Reviewed: yes -->
 <!-- Rev-Revision: 508e255fff6c604c31d5617fe9ddf6d776a3b43d Reviewer: samesch -->
 <book xml:id="book.pcntl" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
@@ -46,7 +46,7 @@
  &reference.pcntl.constants;
  &reference.pcntl.examples;
 
- &reference.pcntl.qosclass;
+ &reference.pcntl.pcntl.qosclass;
 
  &reference.pcntl.reference;