diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2c14cd08b501526e9e3a142117b50b65d95b1211..bd581fe4a275c56fd5a18321e6bebd8977bda340 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -390,6 +390,9 @@ if(HAVE_FLTK OR HAVE_QT OR ENABLE_GRAPHICS)
     endif(NOT FLTK_PNG)
   endif(HAVE_LIBZ)
   find_package(OpenGL REQUIRED)
+  if(NOT OPENGL_GLU_FOUND)
+    message(SEND_ERROR "Could not find GLU")
+  endif(NOT OPENGL_GLU_FOUND)
   add_subdirectory(Graphics)
   set(HAVE_OPENGL TRUE)
   list(APPEND CONFIG_OPTIONS "OpenGL")