— Macro: AC_TYPE_GETGROUPS

Define GETGROUPS_T to be whichever of gid_t or int is the base type of the array argument to getgroups.

— Macro: AC_TYPE_MBSTATE_T

Define HAVE_MBSTATE_T if <wchar.h> declares the mbstate_t type. Also, define mbstate_t to be a type if <wchar.h> does not declare it.

— Macro: AC_TYPE_MODE_T

Equivalent to `AC_CHECK_TYPE(mode_t, int)'.

— Macro: AC_TYPE_OFF_T

Equivalent to `AC_CHECK_TYPE(off_t, long int)'.

— Macro: AC_TYPE_PID_T

Equivalent to `AC_CHECK_TYPE(pid_t, int)'.

— Macro: AC_TYPE_SIGNAL

If signal.h declares signal as returning a pointer to a function returning void, define RETSIGTYPE to be void; otherwise, define it to be int.

Define signal handlers as returning type RETSIGTYPE:

          RETSIGTYPE
          hup_handler ()
          {
          ...
          }
     

— Macro: AC_TYPE_SIZE_T

Equivalent to `AC_CHECK_TYPE(size_t, unsigned int)'.

— Macro: AC_TYPE_UID_T

If uid_t is not defined, define uid_t to be int and gid_t to be int.