From 4becc6ad9368745ad53c6d8b08960462d9c77f42 Mon Sep 17 00:00:00 2001
From: Nick Briggs <nicholas.h.briggs@gmail.com>
Date: Mon, 13 May 2024 15:37:53 -0700
Subject: [PATCH] Not all systems define MAP_FAILED for the return value from
 failing mmap() (#502)

---
 src/ldsout.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ldsout.c b/src/ldsout.c
index e9afd7e..2db964d 100644
--- a/src/ldsout.c
+++ b/src/ldsout.c
@@ -15,7 +15,10 @@
 #include <stdio.h>        // for perror, fprintf, printf, stderr, sprintf
 #include <stdlib.h>       // for exit, free, malloc
 #include <string.h>       // for memset
-#include <sys/mman.h>     // for mmap
+#include <sys/mman.h>     // for mmap, MAP_FAILED
+#ifndef MAP_FAILED
+#define MAP_FAILED	((void *)-1)
+#endif
 #include <sys/stat.h>     // for stat, fstat
 #include <sys/types.h>    // for off_t
 #include <unistd.h>       // for lseek, read, close, getpagesize