--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,8 @@ cmake_minimum_required(VERSION 3.8)
 project(PPSSPP)
 enable_testing()
 
+include(CheckCXXSourceCompiles)
+
 #This is supposed to work but doesn't!
 if(NOT ANDROID)
 	set(CMAKE_CXX_STANDARD 17)