diff --git a/builder/arduino-common.py b/builder/arduino-common.py
index 83e5f18..85a0791 100644
--- a/builder/arduino-common.py
+++ b/builder/arduino-common.py
@@ -12,6 +12,14 @@ LT_ARDUINO_DIR = join(platform.get_dir(), "arduino", "libretuya")
 assert isdir(API_DIR)
 assert isdir(LT_ARDUINO_DIR)
 
+# Flags
+env.Append(
+    CPPDEFINES=[
+        ("ARDUINO", 10812),
+        "ARDUINO_SDK",
+    ]
+)
+
 # Sources - ArduinoCore-API
 env.AddLibrary(
     name="arduino_api",
diff --git a/builder/frameworks/realtek-ambz-arduino.py b/builder/frameworks/realtek-ambz-arduino.py
index bd2f6fe..9f92833 100644
--- a/builder/frameworks/realtek-ambz-arduino.py
+++ b/builder/frameworks/realtek-ambz-arduino.py
@@ -17,31 +17,8 @@ env.SConscript("../arduino-common.py", exports="env")
 
 # Flags
 env.Append(
-    CXXFLAGS=[
-        # borrowed from RtlDuino/development/rtl87xx/platform.txt
-        "-std=c++11",
-        "-mcpu=cortex-m4",
-        "-mthumb",
-        "-mfloat-abi=hard",
-        "-mfpu=fpv4-sp-d16",
-        "-g2",
-        "-w",
-        "-O2",
-        "-MMD",
-        "-fdata-sections",
-        "-ffunction-sections",
-        "-fmessage-length=0",
-        "-fno-common",
-        "-fno-exceptions",
-        "-fno-rtti",
-        "-fno-short-enums",
-        "-fomit-frame-pointer",
-        "-fsigned-char",
-    ],
     CPPDEFINES=[
-        ("ARDUINO", 10812),
         "ARDUINO_AMEBA",
-        "ARDUINO_SDK",
         "ARDUINO_ARCH_AMBZ",
         # the SDK declares bool if not defined before
         # which conflicts with C++ built-in bool
diff --git a/builder/frameworks/realtek-ambz-sdk.py b/builder/frameworks/realtek-ambz-sdk.py
index b42687d..687b9a0 100644
--- a/builder/frameworks/realtek-ambz-sdk.py
+++ b/builder/frameworks/realtek-ambz-sdk.py
@@ -27,6 +27,27 @@ env.Append(
         "-fomit-frame-pointer",
         "-fsigned-char",
     ],
+    CXXFLAGS=[
+        # borrowed from RtlDuino/development/rtl87xx/platform.txt
+        "-std=c++11",
+        "-mcpu=cortex-m4",
+        "-mthumb",
+        "-mfloat-abi=hard",
+        "-mfpu=fpv4-sp-d16",
+        "-g2",
+        "-w",
+        "-O2",
+        "-MMD",
+        "-fdata-sections",
+        "-ffunction-sections",
+        "-fmessage-length=0",
+        "-fno-common",
+        "-fno-exceptions",
+        "-fno-rtti",
+        "-fno-short-enums",
+        "-fomit-frame-pointer",
+        "-fsigned-char",
+    ],
     CPPDEFINES=[
         # LibreTuya configuration
         ("LT_HAS_LWIP", "1"),
@@ -59,7 +80,6 @@ env.Append(
         "-g",
         "--specs=nano.specs",
         "-nostartfiles",
-        "-Wl,-Map=" + join("$BUILD_DIR", "${PROGNAME}.map"),
         "-Os",
         "-Wl,--gc-sections",
         "-Wl,--cref",
diff --git a/builder/utils/env.py b/builder/utils/env.py
index 2c634ef..f22780a 100644
--- a/builder/utils/env.py
+++ b/builder/utils/env.py
@@ -70,6 +70,9 @@ def env_add_defaults(env, platform, board):
             ("MCU", "${MCU}"),
             ("FAMILY", "${FAMILY}"),
         ],
+        LINKFLAGS=[
+            "-Wl,-Map=" + join("$BUILD_DIR", "${PROGNAME}.map"),
+        ],
     )