--- CMakeLists.txt.orig	2012-03-22 16:47:04.000000000 +0100
+++ CMakeLists.txt	2012-03-22 16:47:45.000000000 +0100
@@ -31,8 +31,10 @@
 
 FIND_PROGRAM(FLEX_EXECUTABLE
   NAMES flex
-  PATHS /usr/bin
-  DOC "Flex executable")
+  PATHS /usr/local/bin
+  DOC "Flex executable"
+  NO_DEFAULT_PATH
+  NO_SYSTEM_ENVIRONMENT_PATH)
 
 FIND_PROGRAM(BISON_EXECUTABLE
   NAMES bison