diff --git a/include/config.hpp b/include/config.hpp
new file mode 100644
index 000000000..54041e9b9
--- /dev/null
+++ b/include/config.hpp
@@ -0,0 +1,14 @@
+#ifndef CONFIG_HPP
+#define CONFIG_HPP
+
+// Window DLL support
+
+#ifdef _WINDOWS
+# define MAPNIK_DECL __declspec (dllexport)
+# pragma warning( disable: 4251 )
+# pragma warning( disable: 4275 )
+#else
+# define MAPNIK_DECL 
+#endif
+
+#endif
\ No newline at end of file