diff --git a/opts/CMakeLists.txt b/opts/CMakeLists.txt
index c5d23a0..5286139 100644
--- a/opts/CMakeLists.txt
+++ b/opts/CMakeLists.txt
@@ -1,3 +1,5 @@
+cmake_minimum_required(VERSION 2.8)
+
 find_package(LLVM)
 include(AddLLVM)