diff --git a/samples/sample_c++/platform/linux/raspberry_pi/CMakeLists.txt b/samples/sample_c++/platform/linux/raspberry_pi/CMakeLists.txt
index 792f9a99..a4f7102c 100644
--- a/samples/sample_c++/platform/linux/raspberry_pi/CMakeLists.txt
+++ b/samples/sample_c++/platform/linux/raspberry_pi/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.5)
-project(dji_sdk_demo_on_rpi_cxx CXX)
+project(dji_sdk_demo_on_rpi_cxx)
 
 set(CMAKE_C_FLAGS "-pthread -std=gnu99")
 set(CMAKE_CXX_FLAGS "-std=c++11 -pthread")
@@ -8,6 +8,10 @@ set(CMAKE_C_COMPILER "aarch64-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "aarch64-linux-gnu-g++")
 add_definitions(-D_GNU_SOURCE)
 
+if (NOT USE_SYSTEM_ARCH)
+    add_definitions(-DSYSTEM_ARCH_LINUX)
+endif ()
+
 if (MEMORY_LEAK_CHECK_ON MATCHES TRUE)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=leak")
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=leak")
diff --git a/samples/sample_c/module_sample/utils/util_file.h b/samples/sample_c/module_sample/utils/util_file.h
index bacf5434..5a254e9a 100644
--- a/samples/sample_c/module_sample/utils/util_file.h
+++ b/samples/sample_c/module_sample/utils/util_file.h
@@ -27,12 +27,12 @@
 #ifndef UTIL_FILE_H
 #define UTIL_FILE_H
 
+#ifdef SYSTEM_ARCH_LINUX
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#ifdef SYSTEM_ARCH_LINUX
-
 /* Includes ------------------------------------------------------------------*/
 #include <dji_typedef.h>
 #include <stdio.h>
diff --git a/samples/sample_c/module_sample/utils/util_time.h b/samples/sample_c/module_sample/utils/util_time.h
index 06b2b577..0ca365fb 100644
--- a/samples/sample_c/module_sample/utils/util_time.h
+++ b/samples/sample_c/module_sample/utils/util_time.h
@@ -27,11 +27,12 @@
 #ifndef DJI_UTIL_TIME_H
 #define DJI_UTIL_TIME_H
 
+#ifdef SYSTEM_ARCH_LINUX
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#ifdef SYSTEM_ARCH_LINUX
 
 /* Includes ------------------------------------------------------------------*/
 #include <stdint.h>