diff --git a/mdl/m_output.pas b/mdl/m_output.pas
new file mode 100644
index 0000000..b36fa66
--- /dev/null
+++ b/mdl/m_output.pas
@@ -0,0 +1,31 @@
+{$I M_OPS.PAS}
+
+Unit m_Output;
+
+Interface
+
+{$IFDEF WINDOWS}
+  Uses
+    m_Output_Windows;
+
+  Type
+    TOutput = Class(TOutputWindows);
+{$ENDIF}
+
+{$IFDEF LINUX}
+  Uses m_Output_Linux;
+
+  Type
+    TOutput = Class(TOutputLinux);
+{$ENDIF}
+
+{$IFDEF DARWIN}
+  Uses m_Output_Darwin;
+
+  Type
+    TOutput = Class(TOutputDarwin);
+{$ENDIF}
+
+Implementation
+
+End.