From 84207b2e0f14d2a8fd1ccc435b0c27f30b2ecce8 Mon Sep 17 00:00:00 2001
From: Jon <jon.forums@gmail.com>
Date: Fri, 1 Jun 2012 11:20:28 -0400
Subject: Update in-source build error message

---
 CMakeLists.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8e176c08a..c8b252d2d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,8 +37,9 @@ project(mruby C)
 if(CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR AND NOT (MSVC_IDE OR XCODE))
   message(FATAL_ERROR
           "\nIn-source builds are not allowed as CMake would overwrite the "
-          "Makefiles distributed with mruby. Please change to the 'build' "
-          "subdirectory and run CMake from there.")
+          "Makefiles distributed with mruby. Delete any created 'CMakeFiles' "
+          "subdirectory and 'CMakeCache.txt' file from the current directory, "
+          "change to the 'build' subdirectory, and re-run CMake from there.")
 endif()
 
 if(COMMAND cmake_policy)
-- 
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