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

 Message        Setting speculation control is not available on this
                platform.  The setting will be ignored.

 Description    Setting speculation control in only available on
                certain platforms.  Trying to modify the setting on
                other platforms will have no effect.

 User Action    Remove the speculation setting.