diff --git a/cmake/platforms/OSX.cmake b/cmake/platforms/OSX.cmake
--- a/cmake/platforms/OSX.cmake
+++ b/cmake/platforms/OSX.cmake
@@ -6,10 +6,11 @@
 # 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
@@ -28,8 +29,6 @@
 # Sysroot clang
 set(OSX_EXTRA_FLAGS
 	" -target ${TOOLCHAIN_PREFIX}"
-	" -mmacosx-version-min=10.8"
-	" --sysroot ${OSX_SDK_PATH}"
 	" -mlinker-version=253.9"
 )