diff -Naur a/simulator/src/simulatorlb.c b/simulator/src/simulatorlb.c
--- a/simulator/src/simulatorlb.c	2009-07-28 15:31:16.000000000 +0100
+++ b/simulator/src/simulatorlb.c	2023-09-16 13:52:16.111512487 +0100
@@ -2,7 +2,7 @@
  * This file is copyright ©2009 Corvus Corax
  * Distributed under the terms of the GPL version 2 or higher
  */
-#define _FILE_OFFSET_BITS 64
+#define _LARGEFILE64_SOURCE
 #include <config.h>
 
 #ifdef USE_GNU_SOURCE
@@ -531,3 +531,9 @@
 	}
 	return realread(fd,buf,count);
 }
+
+// copy_file_range() may be used instead so force failure to fall back to read().
+ssize_t copy_file_range(int fd_in, off_t off_in, int fd_out, off_t off_out, size_t len, unsigned int flags) {
+	errno = EXDEV;
+	return -1;
+}