Index: openttd.c
===================================================================
--- openttd.c	(revision 3308)
+++ openttd.c	(working copy)
@@ -60,6 +60,7 @@
 extern void SetDifficultyLevel(int mode, GameOptions *gm_opt);
 extern void DoStartupNewPlayer(bool is_ai);
 extern void ShowOSErrorBox(const char *buf);
+extern char _openttd_revision[];
 
 /* TODO: usrerror() for errors which are not of an internal nature but
  * caused by the user, i.e. missing files or fatal configuration errors.
@@ -120,6 +121,11 @@
 	return mem;
 }
 
+static void showversion(void)
+{
+	ShowInfoF("Version: %s\n", _openttd_revision);
+}
+
 static void showhelp(void)
 {
 	char buf[4096], *p;
@@ -397,6 +403,7 @@
 		case -2:
 		case 'h':
 			showhelp();
+			showversion();
 			return 0;
 		}
 	}