CMake Policies must exist before they can be set

CMakeLists.txt

@@ -1,6 +1,9 @@
 project(Plasma)
 cmake_minimum_required(VERSION 2.8.11.2)
-cmake_policy(SET CMP0054 NEW)
+
+if(POLICY CMP0054)
+    cmake_policy(SET CMP0054 NEW)
+endif()
 
 # Set up Product Identification parameters
 set(PRODUCT_BRANCH_ID   "1"         CACHE STRING "Branch ID")