From 8460059a72312f142c43439a1eab5610c6d85dbe Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 28 Jun 2010 11:35:18 -0400
Subject: FindMPI: Failure is not an error if not REQUIRED

---
 Modules/FindMPI.cmake | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Modules/FindMPI.cmake b/Modules/FindMPI.cmake
index 9e2a3ad..6139d4d 100644
--- a/Modules/FindMPI.cmake
+++ b/Modules/FindMPI.cmake
@@ -274,9 +274,9 @@ elseif (MPI_COMPILE_CMDLINE)
     find_library(MPI_LIB ${LIB} HINTS ${MPI_LINK_PATH})
     if (MPI_LIB)
       list(APPEND MPI_LIBRARIES ${MPI_LIB})
-    else (MPI_LIB)
-      message(SEND_ERROR "Unable to find MPI library ${LIB}")
-    endif (MPI_LIB)
+    elseif (NOT MPI_FIND_QUIETLY)
+      message(WARNING "Unable to find MPI library ${LIB}")
+    endif ()
   endforeach(LIB)
   set(MPI_LIB "MPI_LIB-NOTFOUND" CACHE INTERNAL "Scratch variable for MPI detection" FORCE)
 
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