From a8deac584560a65848f67dac4b7002a0cfb97072 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Tue, 21 Feb 2017 17:04:45 -0500
Subject: [PATCH] add an explicit test for set_escdelay()

Not all curses implementations provide this function, so drop it
from depending on slang (and assuming ncurses) to a general build
time test.
---
 configure.ac | 3 +++
 src/nano.c   | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index bed4b46a..d8e9902b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -546,6 +546,9 @@ fi
 AC_CHECK_LIB([$CURSES_LIB_NAME], [use_default_colors],
 	     [AC_DEFINE(HAVE_USE_DEFAULT_COLORS, 1, [Define this if your curses library has the use_default_colors() command.])],
 	     [], [$CURSES_LIB])
+AC_CHECK_LIB([$CURSES_LIB_NAME], [set_escdelay],
+	     [AC_DEFINE(HAVE_SET_ESCDELAY, 1, [Define this if your curses library has the set_escdelay() function.])],
+	     [], [$CURSES_LIB])
 AC_CHECK_LIB([$CURSES_LIB_NAME], [key_defined],
 	     [AC_DEFINE(HAVE_KEY_DEFINED, 1, [Define this if your curses library has the key_defined() command.])],
 	     [], [$CURSES_LIB])
diff --git a/src/nano.c b/src/nano.c
index e957874d..015909a1 100644
--- a/src/nano.c
+++ b/src/nano.c
@@ -2513,7 +2513,7 @@ int main(int argc, char **argv)
     shiftaltdown = get_keycode("kDN4", SHIFT_ALT_DOWN);
 #endif
 
-#ifndef USE_SLANG
+#ifdef HAVE_SET_ESCDELAY
     /* Tell ncurses to pass the Esc key quickly. */
     set_escdelay(50);
 #endif