OSF versions of 6v0 and 6v2 give illegal instruction error

The 6v0 and 6v2 versions of modeller for Digital Unix (OSF) yield an "Illegal instruction - core dumped" message on all of my OSF machines at various version levels (V4.0F for example). Earlier versions of modeller worked on these machines. Has anyone else seen this? Is there a fix?

Bob Williams