diff --git a/ports/stm32/boards/ARDUINO_PORTENTA_H7/manifest.py b/ports/stm32/boards/ARDUINO_PORTENTA_H7/manifest.py
index b3c6b02e5b..eb53df0fbd 100644
--- a/ports/stm32/boards/ARDUINO_PORTENTA_H7/manifest.py
+++ b/ports/stm32/boards/ARDUINO_PORTENTA_H7/manifest.py
@@ -10,3 +10,10 @@ require("logging")
 
 # Bluetooth
 require("aioble")
+
+# Register external library
+add_library("arduino-lib", "$(ARDUINO_LIB_DIR)")
+
+# RPC
+require("cmwx1", library="arduino-lib")
+require("msgpackrpc", library="arduino-lib")
diff --git a/ports/stm32/boards/ARDUINO_PORTENTA_H7/mpconfigboard.mk b/ports/stm32/boards/ARDUINO_PORTENTA_H7/mpconfigboard.mk
index c56c8f005f..3b173b3acd 100644
--- a/ports/stm32/boards/ARDUINO_PORTENTA_H7/mpconfigboard.mk
+++ b/ports/stm32/boards/ARDUINO_PORTENTA_H7/mpconfigboard.mk
@@ -26,5 +26,8 @@ MICROPY_SSL_MBEDTLS = 1
 MICROPY_PY_OPENAMP = 1
 MICROPY_PY_OPENAMP_REMOTEPROC = 1
 
+ARDUINO_LIB_DIR = lib/arduino-lib
+GIT_SUBMODULES += $(ARDUINO_LIB_DIR)
 FROZEN_MANIFEST = $(BOARD_DIR)/manifest.py
+MICROPY_MANIFEST_ARDUINO_LIB_DIR = $(TOP)/$(ARDUINO_LIB_DIR)
 MBEDTLS_CONFIG_FILE = '"$(BOARD_DIR)/mbedtls_config_board.h"'