diff -Nur buffer-1.19/buffer.c buffer-1.19-largefile/buffer.c
--- buffer-1.19/buffer.c	2016-02-07 20:10:22.272433790 +0100
+++ buffer-1.19-largefile/buffer.c	2016-02-07 20:12:08.612429023 +0100
@@ -113,6 +113,10 @@
  * Initial revision
  * 
  */
+
+#define _FILE_OFFSET_BITS   64
+#define _LARGEFILE_SOURCE 1
+
 #include <unistd.h>
 #include <stdio.h>
 #include <signal.h>