From cba1dd59fdd96b9f4b146a4d647212c2bd736522 Mon Sep 17 00:00:00 2001
From: David Cole <david.cole@kitware.com>
Date: Fri, 18 Sep 2009 12:56:49 -0400
Subject: Better error message tells user possible ways to resolve the error.

---
 Modules/ExternalProject.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index e151096..aacf0b8 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -673,7 +673,7 @@ function(_ep_add_download_command name)
       list(APPEND cmd ${CMAKE_COMMAND} -P ${stamp_dir}/extract-${name}.cmake)
     endif()
   else()
-    message(SEND_ERROR "error: no download info for '${name}'")
+    message(SEND_ERROR "error: no download info for '${name}' -- please specify existing SOURCE_DIR or one of URL, CVS_REPOSITORY and CVS_MODULE, SVN_REPOSITORY or DOWNLOAD_COMMAND")
   endif()
 
   ExternalProject_Add_Step(${name} download
-- 
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