diff --git a/tools/building.py b/tools/building.py
index 1e14ea87c0009e03eebf41d92da87e08e79766f1..ad449b9884e793e07a341bf45e3d4e48a2a1275b 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -328,6 +328,19 @@ def GetVersion():
 
     return '0.%d.%d' % (version, subversion)
 
+def GlobSubDir(sub_dir, ext_name):
+    import os
+    import glob
+
+    list = os.listdir(sub_dir)
+    src = glob.glob(os.path.join(sub_dir, ext_name))
+
+    for item in list:
+        full_subdir = os.path.join(sub_dir, item)
+        if os.path.isdir(full_subdir):
+            src += GlobSubDir(full_subdir, ext_name)
+    return src
+
 def do_copy_file(src, dst):
     import shutil
     # check source file 
diff --git a/tools/wizard.py b/tools/wizard.py
index 2d0ed9efe8e30723ccb84c75fd31404af960c8fd..ff3eb1dac73d6afece046233d514696fbf55313a 100644
--- a/tools/wizard.py
+++ b/tools/wizard.py
@@ -27,6 +27,7 @@ Return('group')
 SConscript_bridge = '''# RT-Thread building script for bridge
 
 import os
+from building import *
 
 cwd = GetCurrentDir()
 objs = []