ошибка: «object_t» в «классе openvrml :: viewer» не называет тип

Я пытаюсь скомпилировать lib ARvrml (из ARToolKit. См. Источник Вот) на Ubuntu и получите это:

g++ -c -I../../../include -I/usr/local/include/openvrml -I/usr/X11R6/include -O -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/libxml2 -I/usr/X11R6/include arViewer.cpp -o arViewer.o
In file included from arViewer.cpp:37:0:
arViewer.h:74:12: error: ‘object_t’ in ‘class openvrml::gl::viewer’ does not name a type
arViewer.h:85:13: error: ‘object_t’ in ‘class openvrml::gl::viewer’ does not name a type
arViewer.h:90:13: error: ‘object_t’ in ‘class openvrml::gl::viewer’ does not name a type
arViewer.h:97:13: error: ‘object_t’ in ‘class openvrml::gl::viewer’ does not name a type
arViewer.cpp: In constructor ‘arVrmlBrowser::arVrmlBrowser()’:
arViewer.cpp:41:71: error: no matching function for call to ‘openvrml::browser::browser(std::ostream&, std::ostream&)’
arViewer.cpp:41:71: note: candidates are:
/usr/local/include/openvrml/openvrml/browser.h:284:9: note: openvrml::browser::browser(openvrml::resource_fetcher&, std::ostream&, std::ostream&)
/usr/local/include/openvrml/openvrml/browser.h:284:9: note:   candidate expects 3 arguments, 2 provided
/usr/local/include/openvrml/openvrml/browser.h:195:24: note: openvrml::browser::browser(openvrml::browser&)
/usr/local/include/openvrml/openvrml/browser.h:195:24: note:   candidate expects 1 argument, 2 provided
arViewer.cpp: At global scope:
arViewer.cpp:269:1: error: ‘object_t’ in ‘class openvrml::viewer’ does not name a type
arViewer.cpp:283:1: error: ‘object_t’ in ‘class openvrml::viewer’ does not name a type
arViewer.cpp:292:1: error: ‘object_t’ in ‘class openvrml::viewer’ does not name a type
arViewer.cpp:305:1: error: ‘object_t’ in ‘class openvrml::viewer’ does not name a type
make: *** [arViewer.o] Error 1

Учитывая, что ARToolkit (без поддержки VRML) работает хорошо и OpenVRML успешно установлен, я не могу понять, в чем здесь проблема.