Upstream don't use doxygen anymore, so don't fail when we enable the
documentation to get the manpages.

--- a/tools/cmake/Documentation.cmake
+++ b/tools/cmake/Documentation.cmake
@@ -9,7 +9,7 @@
 
 #### Generate the html documentation
 if (enable_documentation)
-  find_package(Doxygen REQUIRED)
+  find_package(Doxygen)
 else()
   find_package(Doxygen)
 endif()
@@ -57,8 +57,8 @@
     COMMAND ${CMAKE_COMMAND} -E echo "XX Generate list of files in examples/ for XML tags"
     COMMAND ${CMAKE_HOME_DIRECTORY}/tools/doxygen/list_routing_models_examples.sh '<mount ' > ${CMAKE_BINARY_DIR}/doc/example_lists/example_filelist_xmltag_mount
     COMMAND ${CMAKE_HOME_DIRECTORY}/tools/doxygen/list_routing_models_examples.sh '<link_ctn ' > ${CMAKE_BINARY_DIR}/doc/example_lists/example_filelist_xmltag_linkctn
-    COMMAND ${CMAKE_COMMAND} -E echo "XX Run doxygen"
-    COMMAND ${DOXYGEN_EXECUTABLE} Doxyfile
+    COMMAND ${CMAKE_COMMAND} -E echo "XX DONT Run doxygen (removed in Debian package)"
+#    COMMAND ${DOXYGEN_EXECUTABLE} Doxyfile
     WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/doc
   )
 
