Fix missing include for Cmake 3.2.1

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5b24598a58a604755bdde5db7a5d4adb7c9b532e..6aa1768c0ca63ea41a8cf6853ab4b3bb1a53f6c3 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,7 @@ endif()
 
 include (CheckFunctionExists)
 include (CheckIncludeFile)
+include (CheckLibraryExists)
 include (CheckCXXSourceCompiles)
 include (CheckCXXCompilerFlag)