--- cpp/Makefile.bak	2008-05-16 19:24:00.000000000 +0200
+++ cpp/Makefile	2008-07-31 13:37:25.000000000 +0200
@@ -12,6 +12,9 @@
 include $(top_srcdir)/config/Make.rules
 
 SUBDIRS		= config src include test demo
+ifeq ($(NOPORTDOCS),)
+SUBDIRS		+= doc
+endif
 
 INSTALL_SUBDIRS	= $(install_bindir) $(install_libdir) $(install_includedir) $(install_configdir)