diff --git a/src/gamelog.h b/src/gamelog.h
new file mode 100644
--- /dev/null
+++ b/src/gamelog.h
@@ -0,0 +1,46 @@
+/* $Id$ */
+
+/** @file gamelog.h Functions to be called to log possibly unsafe game events */
+
+#ifndef GAMELOG_H
+#define GAMELOG_H
+
+#include "newgrf_config.h"
+
+enum GamelogActionType {
+	GLAT_START,        ///< Game created
+	GLAT_LOAD,         ///< Game loaded
+	GLAT_GRF,          ///< GRF changed
+	GLAT_CHEAT,        ///< Cheat was used
+	GLAT_PATCH,        ///< Patches setting changed
+	GLAT_END,          ///< So we know how many GLATs are there
+	GLAT_NONE  = 0xFF, ///< No logging active; in savegames, end of list
+};
+
+void GamelogStartAction(GamelogActionType at);
+void GamelogStopAction();
+
+void GamelogReset();
+
+typedef void GamelogPrintProc(const char *s);
+void GamelogPrint(GamelogPrintProc *proc); // needed for WIN32 / WINCE crash.log
+
+void GamelogPrintDebug();
+void GamelogPrintConsole();
+
+void GamelogRevision();
+void GamelogMode();
+void GamelogOldver();
+void GamelogPatch(const char *name, int32 oldval, int32 newval);
+
+void GamelogGRFUpdate(const GRFConfig *oldg, const GRFConfig *newg);
+void GamelogGRFAddList(const GRFConfig *newg);
+void GamelogGRFRemove(uint32 grfid);
+void GamelogGRFAdd(const GRFConfig *newg);
+void GamelogGRFCompatible(const GRFIdentifier *newg);
+
+void GamelogTestRevision();
+void GamelogTestMode();
+void GamelogTestGRF();
+
+#endif /* GAMELOG_H */