diff --git a/lib/Projectrans/Phase2Translator.py b/lib/Projectrans/Phase2Translator.py
index 629b630..014cd1a 100644
--- a/lib/Projectrans/Phase2Translator.py
+++ b/lib/Projectrans/Phase2Translator.py
@@ -2263,8 +2263,22 @@ class Phase2Translator:
             _vlog().info(f"[includes] 需要编译的源文件: {len(self.extra_compile_files)} 个")
 
     def _scan_dir_for_libs(self, directory: str, module_name: str) -> None:
-        """递归扫描目录中的库文件和源文件"""
+        """递归扫描目录中的库文件和源文件
+
+        模块目录含 `.no_autobuild` 标记时直接跳过：该模块的 C/C++ 源码
+        与库文件由 project.vpj linker.static_libs 显式链接（如 fltk 内嵌
+        完整 FLTK/C 源码树，避免误编译整个第三方库）。递归时跳过常见
+        构建/缓存目录（build、cmake-build*、.git、__pycache__、. 开头）。
+        """
+        if _CachedIsFile(os.path.join(directory, '.no_autobuild')):
+            return
         for root, dirs, files in os.walk(directory):
+            dirs[:] = [
+                d for d in dirs
+                if d not in ('.git', '__pycache__', 'build', 'cmake-build')
+                and not d.startswith('cmake-build-')
+                and not d.startswith('.')
+            ]
             for fname in files:
                 fpath = os.path.join(root, fname)
                 _, ext = os.path.splitext(fname)