From de70f691e10b502e09d1683b2d241d559f199948 Mon Sep 17 00:00:00 2001
From: Marco Antognini <antognini.marco@gmail.com>
Date: Sun, 3 Jul 2011 18:45:51 +0200
Subject: [PATCH] Improved cmake for OS X 10.5

---
 CMakeLists.txt     |  4 ++--
 cmake/Config.cmake | 11 ++++++++++-
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9e148948..66dd6a37 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,8 +31,8 @@ set(BUILD_EXAMPLES FALSE CACHE BOOL "TRUE to build the SFML examples, FALSE to i
 set(BUILD_DOC FALSE CACHE BOOL "TRUE to generate the API documentation, FALSE to ignore it")
 
 # Mac OS X specific options
-if (MACOSX)
-    # add an option to build against 10.5 SDK
+if (MACOSX AND MACOSX_VERSION GREATER 5)
+    # add an option to build against 10.5 SDK if current OS X version is greater than 10.5
     set(BUILD_LEOPARD FALSE CACHE BOOL "TRUE to build SFML for OS X 10.5, FALSE to compile with default SDK")
 endif()
 
diff --git a/cmake/Config.cmake b/cmake/Config.cmake
index 23668365..4b80e57e 100644
--- a/cmake/Config.cmake
+++ b/cmake/Config.cmake
@@ -5,7 +5,16 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "Windows")
 elseif(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
     set(LINUX 1)
 elseif(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
-    set(MACOSX 1)
+    set(MACOSX 1)
+
+    # detect OS X version. (use '/usr/bin/sw_vers -productVersion' to extract V from '10.V.x'.)
+    EXEC_PROGRAM(/usr/bin/sw_vers ARGS -productVersion OUTPUT_VARIABLE MACOSX_VERSION_RAW)
+    STRING(REGEX REPLACE "10\\.([0-9]).*" "\\1" MACOSX_VERSION "${MACOSX_VERSION_RAW}")
+    if(${MACOSX_VERSION} LESS 5)
+        message(WARNING "Unsupported version of OS X : ${MACOSX_VERSION_RAW}")
+        return()
+    endif()
+
 else()
     message(WARNING "Unsupported operating system")
     return()