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diff --git a/Build/source/libs/zziplib/zziplib-src/m4/ac_sys_largefile_sensitive.m4 b/Build/source/libs/zziplib/zziplib-src/m4/ac_sys_largefile_sensitive.m4
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-dnl @synopsis AC_SYS_LARGEFILE_SENSITIVE
-dnl
-dnl checker whether the current system is sensitive to -Ddefines making
-dnl off_t having different types/sizes. Automatically define a config.h
-dnl symbol LARGEFILE_SENSITIVE if that is the case, otherwise leave
-dnl everything as is.
-dnl
-dnl This macro builds on top of AC_SYS_LARGEFILE to detect whether
-dnl special options are neede to make the code use 64bit off_t - in
-dnl many setups this will also make the code use 64bit off_t
-dnl immediately.
-dnl
-dnl The common use of a LARGEFILE_SENSITIVE config.h-define is to
-dnl rename exported functions, usually adding a 64 to the original
-dnl function name. Such renamings are only needed on systems being both
-dnl (a) 32bit off_t by default and (b) implementing large.file
-dnl extensions (as for unix98).
-dnl
-dnl a renaming section could look like this:
-dnl
-dnl #if defined LARGEFILE_SENSITIVE && _FILE_OFFSET_BITS+0 == 64
-dnl #define zzip_open zzip_open64
-dnl #define zzip_seek zzip_seek64
-dnl #endif
-dnl
-dnl for libraries, it is best to take advantage of the prefix-config.h
-dnl macro, otherwise you want to export a renamed LARGEFILE_SENSITIVE
-dnl in an installed header file. -> see AX_PREFIX_CONFIG_H
-dnl
-dnl @category Misc
-dnl @author Guido U. Draheim <guidod@gmx.de>
-dnl @version 2009-07-27
-dnl @license GPLWithACException
-
-AC_DEFUN([AC_SYS_LARGEFILE_SENSITIVE],[dnl
-AC_REQUIRE([AC_SYS_LARGEFILE])dnl
-# we know about some internals of ac_sys_largefile here...
-AC_MSG_CHECKING(whether system differentiates 64bit off_t by defines)
-ac_cv_sys_largefile_sensitive="no"
-if test ".${ac_cv_sys_file_offset_bits-no}${ac_cv_sys_large_files-no}" != ".nono"
-then ac_cv_sys_largefile_sensitive="yes"
- AC_DEFINE(LARGEFILE_SENSITIVE, 1,
- [whether the system defaults to 32bit off_t but can do 64bit when requested])
-fi
-AC_MSG_RESULT([$ac_cv_sys_largefile_sensitive])
-])