diff --git a/cmake/platforms/OSX.cmake b/cmake/platforms/OSX.cmake
index 5f3c9c8643..b2c663cdc2 100644
--- a/cmake/platforms/OSX.cmake
+++ b/cmake/platforms/OSX.cmake
@@ -1,42 +1,41 @@
 # Copyright (c) 2017 The Bitcoin developers
 
 set(CMAKE_SYSTEM_NAME Darwin)
 set(TOOLCHAIN_PREFIX x86_64-apple-darwin11)
 
 # On OSX, we use clang by default.
 set(CMAKE_C_COMPILER clang)
 set(CMAKE_CXX_COMPILER clang++)
-# set(CMAKE_CXX_EXTENSIONS OFF)
 
 # On OSX we use various stuff from Apple's SDK.
 set(OSX_SDK_PATH "${CMAKE_CURRENT_SOURCE_DIR}/depends/SDKs/MacOSX10.11.sdk")
+set(CMAKE_OSX_SYSROOT ${OSX_SDK_PATH})
+set(CMAKE_OSX_DEPLOYMENT_TARGET 10.8)
 
 # target environment on the build host system
 #   set 1st to dir with the cross compiler's C/C++ headers/libs
 set(CMAKE_FIND_ROOT_PATH "${CMAKE_CURRENT_SOURCE_DIR}/depends/${TOOLCHAIN_PREFIX};${OSX_SDK_PATH}")
 
 # We also may have built dependancies for the native plateform.
 set(CMAKE_PREFIX_PATH "${CMAKE_CURRENT_SOURCE_DIR}/depends/${TOOLCHAIN_PREFIX}/native")
 
 # modify default behavior of FIND_XXX() commands to
 # search for headers/libs in the target environment and
 # search for programs in the build host environment
 set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
 set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
 set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 
 # Sysroot clang
 set(OSX_EXTRA_FLAGS
 	" -target ${TOOLCHAIN_PREFIX}"
-	" -mmacosx-version-min=10.8"
-	" --sysroot ${OSX_SDK_PATH}"
 	" -mlinker-version=253.9"
 )
 
 string(APPEND CMAKE_C_FLAGS ${OSX_EXTRA_FLAGS})
 string(APPEND CMAKE_CXX_FLAGS ${OSX_EXTRA_FLAGS} " -stdlib=libc++")
 
 # Ensure we use an OSX specific version of ar, ranlib and nm.
 find_program(CMAKE_AR ${TOOLCHAIN_PREFIX}-ar)
 find_program(CMAKE_RANLIB ${TOOLCHAIN_PREFIX}-ranlib)
 find_program(CMAKE_NM ${TOOLCHAIN_PREFIX}-nm)