From: Thorsten Glaser <tg@mirbsd.org>
Subject: Enable Large File Support on (at least) 32-bit Linux
Forwarded: https://github.com/neutrinolabs/xrdp/issues/647
Reviewed-by: Dominik George <nik@naturalnet.de>

--- a/configure.ac
+++ b/configure.ac
@@ -6,6 +6,8 @@
 AM_INIT_AUTOMAKE([1.7.2 foreign])
 AC_CONFIG_MACRO_DIR([m4])
 AC_PROG_CC
+AC_SYS_LARGEFILE
+AC_FUNC_FSEEKO
 AC_C_CONST
 AC_PROG_LIBTOOL
 
@@ -507,6 +509,8 @@
 ])
 
 AC_REQUIRE_AUX_FILE([tap-driver.sh])
+
+CPPFLAGS="-include config_ac.h $CPPFLAGS"
 AC_OUTPUT
 
 echo ""
--- a/libpainter/configure.ac
+++ b/libpainter/configure.ac
@@ -6,6 +6,8 @@
 AM_INIT_AUTOMAKE([1.6 foreign])
 AC_CONFIG_MACRO_DIR([m4])
 AC_PROG_CC
+AC_SYS_LARGEFILE
+AC_FUNC_FSEEKO
 AC_C_CONST
 AC_PROG_LIBTOOL
 PKG_INSTALLDIR
@@ -31,4 +33,5 @@
   tests/Makefile
 ])
 
+CPPFLAGS="-include config_ac.h $CPPFLAGS"
 AC_OUTPUT
--- a/librfxcodec/configure.ac
+++ b/librfxcodec/configure.ac
@@ -7,6 +7,8 @@
 AC_CONFIG_MACRO_DIR([m4])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 AC_PROG_CC
+AC_SYS_LARGEFILE
+AC_FUNC_FSEEKO
 AC_C_CONST
 AC_PROG_LIBTOOL
 PKG_INSTALLDIR
@@ -65,5 +67,6 @@
                  rfxcodec-uninstalled.pc
 ])
 
+CPPFLAGS="-include config_ac.h $CPPFLAGS"
 AC_OUTPUT