From 8278c1892e60f34d8c870aca83886520b8ba41f1 Mon Sep 17 00:00:00 2001
From: LordBlick <LordBlick@gmail.com>
Date: Sun, 20 Sep 2015 19:58:57 +0200
Subject: [PATCH] Disallow building in source tree to keep it clean

---
 CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 09fa2cdcc7..e0a450b836 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,9 @@
 cmake_minimum_required( VERSION 2.8.4 FATAL_ERROR )
 
+if ( ${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR} )
+    message( FATAL_ERROR "In-source builds not allowed. Please make a new directory (called a build directory) and run CMake from there, points here. You may need to remove CMakeCache.txt." )
+endif()
+
 project( kicad-i18n NONE )
 
 find_package( Gettext REQUIRED )