From 10da3f74eabe822bc8d6d19d3cee3adf1efdeecd Mon Sep 17 00:00:00 2001
From: Philip Lowman <philip@yhbt.com>
Date: Mon, 16 Mar 2009 22:28:35 -0400
Subject: [PATCH] BUG: Eliminates detection of Boost system library prior to
 1.35 (see issue #8734)

---
 Modules/FindBoost.cmake | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Modules/FindBoost.cmake b/Modules/FindBoost.cmake
index 20198af69..f4ccf09ab 100644
--- a/Modules/FindBoost.cmake
+++ b/Modules/FindBoost.cmake
@@ -299,9 +299,19 @@ endif(Boost_FIND_VERSION_EXACT)
 # Boost.
 set(Boost_ERROR_REASON)
 
-
 SET( _boost_IN_CACHE TRUE)
 IF(Boost_INCLUDE_DIR)
+
+  # On versions < 1.35, remove the System library from the considered list
+  # since it wasn't added until 1.35.
+  if(Boost_VERSION)
+     math(EXPR _boost_maj "${Boost_VERSION} / 100000")
+     math(EXPR _boost_min "${Boost_VERSION} / 100 % 1000")
+     if(${_boost_maj}.${_boost_min} VERSION_LESS 1.35)
+       list(REMOVE_ITEM Boost_FIND_COMPONENTS system)
+     endif()
+  endif()
+
   FOREACH(COMPONENT ${Boost_FIND_COMPONENTS})
     STRING(TOUPPER ${COMPONENT} COMPONENT)
     IF(NOT Boost_${COMPONENT}_FOUND)