diff --git a/CMakeLists.txt b/CMakeLists.txt
index d2ee230..3360de3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,6 +22,7 @@ include( FindPkgConfig          )
 include( CheckFunctionExists    )
 include( CheckSymbolExists      )
 include( CheckIncludeFile       )
+include( CheckIncludeFileCXX    )
 include( CheckLibraryExists     )
 include( CheckCSourceCompiles   )
 include( CheckCXXSourceCompiles )