D=NATURAL (OpenVMS Alpha and OpenVMS I64)
                                   D=VAX (OpenVMS VAX)

  Controls the default alignment rules.  Note that specifying  the
  ALIGN   attribute   overrides  any  value  that  you  previously
  specified for this qualifier.

  You can specify the following values for keyword:

     NATURAL
       Uses natural alignment when positioning record fields or
       array components.

       Natural alignment is when a record field or an array component is
       positioned on a boundary based on its size. For example, 32-bit
       integers are aligned on the nearest 32-bit boundary.

       Default on OpenVMS Alpha and OpenVMS I64 systems.

       In prior versions, the compiler spelled this keyword Alpha_AXP.
       It is still accepted for upward compatability.

     VAX
       Uses byte alignment when positioning record fields or array
       components. Record fields or array components larger than 32-bits
       are positioned on the nearest byte boundary.

       Default on OpenVMS VAX systems.

  On OpenVMS VAX systems, when you specify  a  value  of  NATURAL,
  automatic  variables  are aligned on longword boundaries instead
  of  quadword  boundaries.   This  occurs  because  the   largest
  allowable alignment for the stack is longword alignment.