diff --git a/CMakeLists.txt b/CMakeLists.txt
index a19b9be..5b724c0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,6 +20,7 @@ set( VERSION R14.0.6 )
 
 include( FindPkgConfig          )
 include( CheckFunctionExists    )
+include( CheckSymbolExists      )
 include( CheckIncludeFile       )
 include( CheckLibraryExists     )
 include( CheckCSourceCompiles   )