diff --git a/toolbox/CMakeLists.txt b/toolbox/CMakeLists.txt
index e789a08..2502ae5 100644
--- a/toolbox/CMakeLists.txt
+++ b/toolbox/CMakeLists.txt
@@ -9,6 +9,7 @@ set(TOOLBOX_SRC
 	rm.cpp
 	mm.cpp
 	os.cpp
+	os_internal.cpp
 	qd.cpp
 	sane.cpp
 )
diff --git a/toolbox/os_internal.cpp b/toolbox/os_internal.cpp
new file mode 100644
index 0000000..2b8529c
--- /dev/null
+++ b/toolbox/os_internal.cpp
@@ -0,0 +1,7 @@
+#include "os_internal.h"
+
+namespace OS { namespace Internal {
+
+	std::deque<FDEntry> FDTable;
+
+} }
diff --git a/toolbox/os_internal.h b/toolbox/os_internal.h
new file mode 100644
index 0000000..444b7a2
--- /dev/null
+++ b/toolbox/os_internal.h
@@ -0,0 +1,29 @@
+#ifndef __mpw_os_internal_h__
+#define __mpw_os_internal_h__
+
+#include <deque>
+#include <string>
+
+namespace OS { namespace Internal {
+
+
+	struct FDEntry
+	{
+		int refcount;
+		bool text;
+		bool resource;
+
+		// std::string path?
+
+		FDEntry() :
+			refcount(0), 
+			text(false), 
+			resource(false)
+		{}
+	};
+
+	extern std::deque<FDEntry> FDTable;
+
+} }
+
+#endif