diff --git a/src/system/BUILD.gn b/src/system/BUILD.gn
index 40ae99ae99c77e..5d0e336f22a6dc 100644
--- a/src/system/BUILD.gn
+++ b/src/system/BUILD.gn
@@ -43,6 +43,8 @@ declare_args() {
   #
   # see https://clang.llvm.org/docs/ThreadSafetyAnalysis.html
   chip_enable_thread_safety_checks = is_clang
+
+  chip_external_sdk_target = ""
 }
 
 if (chip_project_config_include_dirs == [] &&
@@ -197,6 +199,9 @@ source_set("system_config_header") {
       if (chip_device_platform == "bl702l") {
         public_deps += [ "${bouffalolab_iot_sdk_build_root}/bl702l:bl_iot_sdk" ]
       }
+      if (chip_external_sdk_target != "") {
+        public_deps += [ "${chip_external_sdk_target}" ]
+      }
 
       # Add platform here as needed.
     }