diff --git a/include/tile2x11.h b/include/tile2x11.h
new file mode 100644
index 000000000..78400dbdc
--- /dev/null
+++ b/include/tile2x11.h
@@ -0,0 +1,18 @@
+/*	SCCS Id: @(#)tile2x11.h 3.3	95/01/25	*/
+/* NetHack may be freely redistributed.  See license for details. */
+
+#ifndef TILE2X11_H
+#define TILE2X11_H
+
+/*
+ * Header for the x11 tile map.
+ */
+typedef struct {
+    unsigned long version;
+    unsigned long ncolors;
+    unsigned long tile_width;
+    unsigned long tile_height;
+    unsigned long ntiles;
+} x11_header;
+
+#endif	/* TILE2X11_H */