diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index bcd7a5984..608437f3a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -3,6 +3,7 @@ cmake_minimum_required(VERSION 2.6)
 project(minetest)
 
 INCLUDE(CheckIncludeFiles)
+INCLUDE(CheckLibraryExists)
 
 # Add custom SemiDebug build mode
 set(CMAKE_CXX_FLAGS_SEMIDEBUG "-O1 -g -Wall -Wabi" CACHE STRING