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(autoconf.info)Particular Structures

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Particular Structure Checks
---------------------------

   The following macros check for certain structures or structure
members.

 - Macro: AC_STRUCT_ST_BLKSIZE
     If `struct stat' contains an `st_blksize' member, define
     `HAVE_STRUCT_STAT_ST_BLKSIZE'.  The former name, `HAVE_ST_BLKSIZE'
     is to be avoided, as its support will cease in the future.  This
     macro is obsoleted, and should be replaced by

          AC_CHECK_MEMBERS([struct stat.st_blksize])

 - Macro: AC_STRUCT_ST_BLOCKS
     If `struct stat' contains an `st_blocks' member, define
     `HAVE_STRUCT STAT_ST_BLOCKS'.  Otherwise, require an `AC_LIBOBJ'
     replacement of `fileblocks'.  The former name, `HAVE_ST_BLOCKS' is
     to be avoided, as its support will cease in the future.

 - Macro: AC_STRUCT_ST_RDEV
     If `struct stat' contains an `st_rdev' member, define
     `HAVE_STRUCT_STAT_ST_RDEV'.  The former name for this macro,
     `HAVE_ST_RDEV', is to be avoided as it will cease to be supported
     in the future.  Actually, even the new macro is obsolete, and
     should be replaced by:
          AC_CHECK_MEMBERS([struct stat.st_rdev])

 - Macro: AC_STRUCT_TM
     If `time.h' does not define `struct tm', define `TM_IN_SYS_TIME',
     which means that including `sys/time.h' had better define `struct
     tm'.

 - Macro: AC_STRUCT_TIMEZONE
     Figure out how to get the current timezone.  If `struct tm' has a
     `tm_zone' member, define `HAVE_STRUCT_TM_TM_ZONE' (and the
     obsoleted `HAVE_TM_ZONE').  Otherwise, if the external array
     `tzname' is found, define `HAVE_TZNAME'.