+AC_ARG_ENABLE(64_bit_archive,
+ AS_HELP_STRING([--enable-64-bit-archive],
+ [force 64-bit archives]),
+[case "${enableval}" in
+ yes) want_64_bit_archive=true ;;
+ no) want_64_bit_archive=false ;;
+ *) AC_MSG_ERROR(bad value ${enableval} for 64-bit-archive option) ;;
+esac],[want_64_bit_archive=unset])dnl
+