diff --git a/include/eti.h b/include/eti.h
new file mode 100644
index 0000000..3c3302d
--- /dev/null
+++ b/include/eti.h
@@ -0,0 +1,55 @@
+/****************************************************************************
+ * Copyright 2020 Thomas E. Dickey                                          *
+ * Copyright 1998-2002,2003 Free Software Foundation, Inc.                  *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+
+/****************************************************************************
+ *   Author:  Juergen Pfeifer, 1995,1997                                    *
+ ****************************************************************************/
+
+/* $Id: eti.h,v 1.9 2020/02/02 23:34:34 tom Exp $ */
+
+#ifndef NCURSES_ETI_H_incl
+#define NCURSES_ETI_H_incl 1
+
+#define	E_OK			(0)
+#define	E_SYSTEM_ERROR	 	(-1)
+#define	E_BAD_ARGUMENT	 	(-2)
+#define	E_POSTED	 	(-3)
+#define	E_CONNECTED	 	(-4)
+#define	E_BAD_STATE	 	(-5)
+#define	E_NO_ROOM	 	(-6)
+#define	E_NOT_POSTED		(-7)
+#define	E_UNKNOWN_COMMAND	(-8)
+#define	E_NO_MATCH		(-9)
+#define	E_NOT_SELECTABLE	(-10)
+#define	E_NOT_CONNECTED	        (-11)
+#define	E_REQUEST_DENIED	(-12)
+#define	E_INVALID_FIELD	        (-13)
+#define	E_CURRENT		(-14)
+
+#endif