Add a check for a shared polarssl library. This checks to see that the

system version is new enough, and is compiled with havege support.

CMakeLists.txt

@@ -602,10 +602,17 @@ if(USE_UPNP)
 	add_definitions(-DUSE_UPNP)
 endif()
 
-
-message("Using PolarSSL from Externals")
-add_subdirectory(Externals/polarssl/)
-include_directories(Externals/polarssl/include)
+if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND NOT ANDROID)
+	include(FindPolarSSL)
+endif()
+if(POLARSSL_FOUND AND POLARSSL_WORKS)
+	message("Using shared PolarSSL")
+	include_directories(${POLARSSL_INCLUDE_DIR})
+else()
+	message("Using PolarSSL from Externals")
+	add_subdirectory(Externals/polarssl/)
+	include_directories(Externals/polarssl/include)
+endif()
 
 if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND NOT ANDROID)
 	check_lib(SOIL SOIL SOIL/SOIL.h QUIET)