diff --git a/examples/gltest.rb b/examples/gltest.rb
index 409d7e9a0452d103a5463c82ca236f3f282c72db..bcc3baebaa9c8e862d3d8126f0b884112148d6cb 100755
--- a/examples/gltest.rb
+++ b/examples/gltest.rb
@@ -3,12 +3,12 @@
 require 'fox16'
 begin
   require 'opengl'
+  require 'glu'
 rescue LoadError
   require 'fox16/missingdep'
   MSG = <<EOM
-  Sorry, this example depends on the OpenGL extension. Please
-  check the Ruby Application Archives for an appropriate
-  download site.
+  Sorry, this example depends on the opengl gems. Please execute:
+    gem install opengl glu
 EOM
   missingDependency(MSG)
 end
diff --git a/lib/fox16/glshapes.rb b/lib/fox16/glshapes.rb
index d612a1231c85f3dff7844e54664e412bcd3c8e0d..d5017a6fee70d9e1f9afc403782f6827bc8c1300 100755
--- a/lib/fox16/glshapes.rb
+++ b/lib/fox16/glshapes.rb
@@ -1,4 +1,5 @@
 require 'opengl'
+require 'glu'
 
 module Fox