VMS Help CC, Messages, ALIGNCONST  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        Integer constant alignment <number> is not
                necessarily supported on all platforms.

 Description    Although the specified alignment value is valid on
                this system, it might not be valid on other systems.
                For example, 16 is a valid alignment value on Alpha
                systems but would not be valid on VAX systems.

 User Action    Be aware of this potential portability issue.