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diff --git a/windows/tariffcalculator.pas b/windows/tariffcalculator.pas
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+++ b/windows/tariffcalculator.pas
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+unit TariffCalculator;
+
+{$mode ObjFPC}{$H+}
+
+interface
+
+uses
+  SysUtils, CTypes;
+
+type
+  // Can't use the class directly, so it is treated as an opaque handle.
+  // THandle is guaranteed to have the right size, even on other platforms.
+  TariffCalculatorHandle = THandle;
+
+function NewTariffCalculator: TariffCalculatorHandle; stdcall;
+procedure DeleteTariffCalculator(handle: TariffCalculatorHandle); stdcall;
+
+function InitGitLibrary: cint32; stdcall;
+function ShutdownGitLibrary: cint32; stdcall;
+function CloneRepository(var url; var local_path) : cint32; stdcall;
+
+implementation
+
+const
+  DLLName = 'CalculatorCInterface.dll';
+
+function NewTariffCalculator: TariffCalculatorHandle; stdcall; external DLLName;
+procedure DeleteTariffCalculator(handle: TariffCalculatorHandle); stdcall; external DLLName;
+
+function InitGitLibrary: cint32; stdcall; external DLLName;
+function ShutdownGitLibrary: cint32; stdcall; external DLLName;
+function CloneRepository(var url; var local_path) : cint32; stdcall; external DLLName;
+
+end.
+