From f74ea0641e9bf287acf22fac9f6eeea571b01800 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Sat, 6 Nov 2021 11:28:04 +0000
Subject: [PATCH] src/keys.c: used KEY_EVENT only if it exists

On ncurses-6.3 the build fails as:

    src/keys.c:122:6: error: 'KEY_EVENT' undeclared here (not in a function); did you mean 'KEY_SLEFT'?
      122 |     {KEY_EVENT, "event"},
          |      ^~~~~~~~~
          |      KEY_SLEFT

ncurses-6.3 deprecated KEY_EVENT as:

     * mark wgetch-events feature as deprecated.
          + prevent  KEY_EVENT  from  appearing  in  curses.h  unless the
            configure option --enable-wgetch-events is used.
---
 src/keys.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/keys.c b/src/keys.c
index f62bdae..d35e425 100644
--- a/src/keys.c
+++ b/src/keys.c
@@ -119,7 +119,10 @@ struct keymap keymaps[] = {
     {KEY_UNDO, "undo"},
     {KEY_MOUSE, "mouse"},
     {KEY_RESIZE, "resize"},
+/* Optional deprecated ncurses feature. */
+#ifdef KEY_EVENT
     {KEY_EVENT, "event"},
+#endif
     {1, "C-a"},
     {2, "C-b"},
     {3, "C-c"},