From 5991cfb42d6350ffd165c4d0a44bbaae3b60f175 Mon Sep 17 00:00:00 2001
From: Bill Hoffman <bill.hoffman@kitware.com>
Date: Tue, 17 Jun 2008 21:46:34 -0400
Subject: [PATCH] ENH: no fatal error if not required

---
 Modules/FindSWIG.cmake | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Modules/FindSWIG.cmake b/Modules/FindSWIG.cmake
index e1f9d7449..e31aab570 100644
--- a/Modules/FindSWIG.cmake
+++ b/Modules/FindSWIG.cmake
@@ -20,8 +20,12 @@ IF(SWIG_EXECUTABLE)
     ERROR_VARIABLE SWIG_swiglib_error
     RESULT_VARIABLE SWIG_swiglib_result)
 
-  IF(SWIG_swiglib_result)
-    MESSAGE(SEND_ERROR "Command \"${SWIG_EXECUTABLE} -swiglib\" failed with output:\n${SWIG_swiglib_error}")
+  IF(SWIG_swiglib_result) 
+    IF(SWIG_FIND_REQUIRED)
+      MESSAGE(SEND_ERROR "Command \"${SWIG_EXECUTABLE} -swiglib\" failed with output:\n${SWIG_swiglib_error}")
+    ELSE(SWIG_FIND_REQUIRED)
+      MESSAGE(STATUS "Command \"${SWIG_EXECUTABLE} -swiglib\" failed with output:\n${SWIG_swiglib_error}")
+    ENDIF(SWIG_FIND_REQUIRED)
   ELSE(SWIG_swiglib_result)
     STRING(REGEX REPLACE "[\n\r]+" ";" SWIG_swiglib_output ${SWIG_swiglib_output})
     # force the path to be computed each time in case SWIG_EXECUTABLE has changed.