diff --git a/tools/atree/options.h b/tools/atree/options.h
new file mode 100644
index 0000000..a227d0f
--- /dev/null
+++ b/tools/atree/options.h
@@ -0,0 +1,14 @@
+#ifndef OPTIONS_H
+#define OPTIONS_H
+
+#include <string>
+#include <vector>
+
+using namespace std;
+
+extern vector<string> g_listFiles;
+extern vector<string> g_inputBases;
+extern string g_outputBase;
+extern bool g_useHardLinks;
+
+#endif // OPTIONS_H