diff --git a/bsp/abstract-machine/.gitignore b/bsp/abstract-machine/.gitignore
index 655483d..27ab723 100644
--- a/bsp/abstract-machine/.gitignore
+++ b/bsp/abstract-machine/.gitignore
@@ -1,3 +1,2 @@
 rtconfig.h
 files.mk
-am-apps.mk
diff --git a/bsp/abstract-machine/Makefile b/bsp/abstract-machine/Makefile
index cdd1f67..94f778c 100644
--- a/bsp/abstract-machine/Makefile
+++ b/bsp/abstract-machine/Makefile
@@ -1,4 +1,5 @@
 ARCH ?= native
+AM_APPS_MK = build/${ARCH}/am-apps.mk
 FILE_MK = files.mk
 FILE_TMP = .tmp.$(FILE_MK)
 RTCONFIG_H = rtconfig.h
@@ -9,7 +10,7 @@ CFLAGS += -DHAVE_CCONFIG_H -D__RTTHREAD__
 CFLAGS += -Wno-nonnull-compare
 LDFLAGS += -T extra.ld
 -include $(FILE_MK)
--include am-apps.mk
+-include $(AM_APPS_MK)
 include $(AM_HOME)/Makefile
 
 $(RTCONFIG_H):
@@ -29,7 +30,11 @@ menuconfig:
 	scons --genconfig
 	$(MAKE) init
 
-update:
-	python integrate-am-apps.py ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE)
+ifneq ($(MAKECMDGOALS),clean)
+update: $(AM_APP_MK)
+$(AM_APPS_MK): integrate-am-apps.py
+	mkdir -p $(@D)
+	python3 $^ ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE)
+endif
 
-.PHONY: init menuconfig
+.PHONY: init menuconfig update
diff --git a/bsp/abstract-machine/integrate-am-apps.py b/bsp/abstract-machine/integrate-am-apps.py
index b3f50a4..8968df3 100644
--- a/bsp/abstract-machine/integrate-am-apps.py
+++ b/bsp/abstract-machine/integrate-am-apps.py
@@ -27,7 +27,7 @@ if not sys.argv[2].startswith("CROSS_COMPILE="):
 CROSS_COMPILE = sys.argv[2][14:]
 
 Path("build").mkdir(exist_ok=True)
-am_app_mk_fp = open("am-apps.mk", "w")
+am_app_mk_fp = open(f"build/{ARCH}/am-apps.mk", "w")
 am_app_c_fp  = open("build/am-apps.c" , "w")
 lib_sym = [
   "memset", "memcpy", "memmove", "memcmp",