--- CMakeLists.txt~	2016-01-24 20:16:54.000000000 +1100
+++ CMakeLists.txt	2016-02-29 14:04:08.376365000 +1100
@@ -2,11 +2,6 @@
 # require at least cmake 2.8
 cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR )
 
-# prevent in-tree building
-if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
-    message(FATAL_ERROR "In-source builds are not allowed.")
-endif()
-
 if(COMMAND cmake_policy)
   cmake_policy(SET CMP0003 NEW)
 endif(COMMAND cmake_policy)