+ENTRYPOINT ModeSpecOpt penrose_opts =
+{sizeof opts / sizeof opts[0], opts, sizeof vars / sizeof vars[0], vars, desc};
+
+#ifdef USE_MODULES
+ModStruct penrose_description =
+{"penrose", "init_penrose", "draw_penrose", "release_penrose",
+ "init_penrose", "init_penrose", (char *) NULL, &penrose_opts,
+ 10000, 1, 1, -40, 64, 1.0, "",
+ "Shows Penrose's quasiperiodic tilings", 0, NULL};
+
+#endif
+
+/*-
+ * Annoyingly the ANSI C library people have reserved all identifiers
+ * ending with _t for future use. Hence we use _c as a suffix for
+ * typedefs (c for class, although this is not C++).
+ */
+
+#define MINSIZE 5
+
+/*-
+ * In theory one could fit 10 tiles to a single vertex. However, the
+ * vertex rules only allow at most seven tiles to meet at a vertex.
+ */
+
+#define CELEBRATE 31415 /* This causes a pause, an error occurred. */
+#define COMPLETION 3141 /* This causes a pause, tiles filled up screen. */