diff --git a/Modules/CMakeDetermineSystem.cmake b/Modules/CMakeDetermineSystem.cmake
index d9f7579e3..f7a32b706 100644
--- a/Modules/CMakeDetermineSystem.cmake
+++ b/Modules/CMakeDetermineSystem.cmake
@@ -131,6 +131,7 @@ else()
   set(PRESET_CMAKE_SYSTEM_NAME FALSE)
 endif()
 
+include(Platform/${CMAKE_SYSTEM_NAME}-Determine OPTIONAL)
 
 macro(ADJUST_CMAKE_SYSTEM_VARIABLES _PREFIX)
   if(NOT ${_PREFIX}_NAME)
diff --git a/Modules/CMakeSystem.cmake.in b/Modules/CMakeSystem.cmake.in
index 70c98d5ca..ef8aaa045 100644
--- a/Modules/CMakeSystem.cmake.in
+++ b/Modules/CMakeSystem.cmake.in
@@ -9,7 +9,7 @@ set(CMAKE_SYSTEM "@CMAKE_SYSTEM@")
 set(CMAKE_SYSTEM_NAME "@CMAKE_SYSTEM_NAME@")
 set(CMAKE_SYSTEM_VERSION "@CMAKE_SYSTEM_VERSION@")
 set(CMAKE_SYSTEM_PROCESSOR "@CMAKE_SYSTEM_PROCESSOR@")
-
+@CMAKE_SYSTEM_CUSTOM_CODE@
 set(CMAKE_CROSSCOMPILING "@CMAKE_CROSSCOMPILING@")
 
 set(CMAKE_SYSTEM_LOADED 1)