From d7b12661e53d5c51684e2208f716ae6d43e111dc Mon Sep 17 00:00:00 2001
From: David Hodo <david.hodo@gmail.com>
Date: Sat, 21 Jul 2012 11:13:13 -0500
Subject: [PATCH] should have been if NOT defined

---
 serial.cmake | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/serial.cmake b/serial.cmake
index f6a141c..6a0b125 100644
--- a/serial.cmake
+++ b/serial.cmake
@@ -23,9 +23,9 @@ macro(build_serial)
     endif()
   endif(UNIX)
 
-  IF(DEFINED BUILD_NO_CLANG)
+  IF(NOT DEFINED BUILD_NO_CLANG)
     option(BUILD_NO_CLANG "Do not use the Clang compiler." OFF)
-  ENDIF(DEFINED BUILD_NO_CLANG)
+  ENDIF(NOT DEFINED BUILD_NO_CLANG)
 
   # Use clang if available
   IF(EXISTS /usr/bin/clang AND NOT BUILD_NO_CLANG)