diff --git a/ext/extconf.rb b/ext/extconf.rb
index 313ebda..274e04d 100755
--- a/ext/extconf.rb
+++ b/ext/extconf.rb
@@ -16,7 +16,11 @@ require "mkmf"
 # extconf.rb --with-opencv-include=/path/to/opencv/include
 
 dir_config("opencv", "/usr/local/include/opencv", "/usr/local/lib")
-dir_config("ffcall", "/usr/local/include", "/usr/local/lib")
+if CONFIG["arch"].include?("darwin")
+	dir_config("ffcall", "/opt/local/include", "/opt/local/lib")
+else
+	dir_config("ffcall", "/usr/local/include", "/usr/local/lib")
+end
 
 opencv_libraries = ["cxcore", "cv", "highgui"]