--- configure.ac.old	2016-04-22 20:19:09.000000000 +0400
+++ configure.ac	2017-10-29 18:23:08.590993137 +0400
@@ -22,6 +22,8 @@
 dnl also change VERSION below
 AC_INIT([ClamAV], [0.99.2], [http://bugs.clamav.net/], [clamav], [http://www.clamav.net/])
 
+AC_SYS_LARGEFILE
+
 AH_BOTTOM([#include "platform.h"])
 dnl put configure auxiliary into config
 AC_CONFIG_AUX_DIR([config])