#serial 12dnl By default, many hosts won't let programs access large files;dnl one must use special compiler options to get large-file access to work.dnl For more details about this brain damage please see:dnl http://www.sas.com/standards/large.file/x_open.20Mar96.htmldnl Written by Paul Eggert <eggert@twinsun.com>.dnl Internal subroutine of AC_SYS_LARGEFILE.dnl AC_SYS_LARGEFILE_TEST_INCLUDESAC_DEFUN(AC_SYS_LARGEFILE_TEST_INCLUDES,  [[#include <sys/types.h>    int a[(off_t) 9223372036854775807 == 9223372036854775807 ? 1 : -1];  ]])dnl Internal subroutine of AC_SYS_LARGEFILE.dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR, COMMENT, INCLUDES, FUNCTION-BODY)AC_DEFUN(AC_SYS_LARGEFILE_MACRO_VALUE,  [AC_CACHE_CHECK([for $1 value needed for large files], $3,     [$3=no      AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES$5        ,	[$6], 	,	[AC_TRY_COMPILE([#define $1 $2]AC_SYS_LARGEFILE_TEST_INCLUDES$5	   ,	   [$6],	   [$3=$2])])])   if test "[$]$3" != no; then     AC_DEFINE_UNQUOTED([$1], [$]$3, [$4])   fi])AC_DEFUN(AC_SYS_LARGEFILE,  [AC_ARG_ENABLE(largefile,     [  --disable-largefile     omit support for large files])   if test "$enable_largefile" != no; then     AC_CACHE_CHECK([for special C compiler options needed for large files],       ac_cv_sys_largefile_CC,       [ac_cv_sys_largefile_CC=no        if test "$GCC" != yes; then	  # IRIX 6.2 and later do not support large files by default,	  # so use the C compiler's -n32 option if that helps.	  AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, , ,	    [ac_save_CC="$CC"	     CC="$CC -n32"	     AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, ,	       ac_cv_sys_largefile_CC=' -n32')	     CC="$ac_save_CC"])        fi])     if test "$ac_cv_sys_largefile_CC" != no; then       CC="$CC$ac_cv_sys_largefile_CC"     fi     AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,       ac_cv_sys_file_offset_bits,       [Number of bits in a file offset, on hosts where this is settable.])     AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,       ac_cv_sys_largefile_source,       [Define to make ftello visible on some hosts (e.g. HP-UX 10.20).],       [#include <stdio.h>], [return !ftello;])     AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,       ac_cv_sys_large_files,       [Define for large files, on AIX-style hosts.])     AC_SYS_LARGEFILE_MACRO_VALUE(_XOPEN_SOURCE, 500,       ac_cv_sys_xopen_source,       [Define to make ftello visible on some hosts (e.g. glibc 2.1.3).],       [#include <stdio.h>], [return !ftello;])   fi  ])