--- simon-0.4.0/CMakeLists.txt
+++ simon-0.4.0/CMakeLists.txt
@@ -68,7 +68,7 @@
   "PocketSphinx is a small-footprint continuous speech recognition system"
   "http://cmusphinx.sourceforge.net/" FALSE "" 
   "Required to build Pocket Sphinx backend")
-find_package(OpenCV)
+macro_optional_find_package(OpenCV)
 macro_log_feature(OpenCV_FOUND "OpenCV"
   "OpenCV (Open Source Computer Vision) is a library of programming functions for real time computer vision" "http://http://opencv.willowgarage.com/"
   FALSE "" "Required for Simon Vision")