From 06e8a1b29bea85fb3daeb1e3c7393bc78a8dffdb Mon Sep 17 00:00:00 2001
From: Guillem Jover <guillem@hadrons.org>
Date: Sat, 1 Apr 2023 12:45:04 +0200
Subject: [PATCH] Define _NSIG if it is not defined by the system

At least on macOS this macro is not defined.
---
 src/readpassphrase.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/readpassphrase.c b/src/readpassphrase.c
index f9f6195..0082c82 100644
--- a/src/readpassphrase.c
+++ b/src/readpassphrase.c
@@ -36,6 +36,15 @@
 #define TCSASOFT 0
 #endif
 
+#ifndef _NSIG
+#if defined(NSIG)
+#define _NSIG NSIG
+#else
+/* The SIGRTMAX define might be set to a function such as sysconf(). */
+#define _NSIG (SIGRTMAX + 1)
+#endif
+#endif
+
 static volatile sig_atomic_t signo[_NSIG];
 
 static void handler(int);