Index: gcc/configure.ac
===================================================================
--- gcc/configure.ac	(revision 166189)
+++ gcc/configure.ac	(working copy)
@@ -304,6 +304,8 @@ AC_USE_SYSTEM_EXTENSIONS
 AC_PROG_CPP
 AC_C_INLINE
 
+AC_SYS_LARGEFILE
+
 # sizeof(char) is 1 by definition.
 AC_CHECK_SIZEOF(void *)
 AC_CHECK_SIZEOF(short)
Index: libcpp/configure.ac
===================================================================
--- libcpp/configure.ac	(revision 166218)
+++ libcpp/configure.ac	(working copy)
@@ -14,6 +14,8 @@ AC_PROG_CC
 AC_PROG_CXX
 AC_PROG_RANLIB
 
+AC_SYS_LARGEFILE
+
 # See if we are building gcc with C++.
 # Do this early so setting lang to C++ affects following tests
 AC_ARG_ENABLE(build-with-cxx,