Maybe start a SourceForge project for xotcl so you have access to SourceForge's compile farm? http://sourceforge.net/index.php http://sourceforge.net/docman/display_doc.php?docid=762&group_id=1
Unfortunately, as noted in the host list above, HP-UX and other old-school linux variants (AIX, IRIX) are not available in their list. You can get HP-UX test accounts through the HP/Compaq testdrive center.
In any case, this was one issue that seemed to be a x-platform issue that only arose seriously on HP. I find that is actually a good advantage to many platforms - this would not be the first general bug that was highlighted by slight mem mgmt or other differences of a single platform. In fact, the extra 'break' issue I highlighted yesterday was also found by the Solaris Forte compiler as a general warning, but gcc missed it. I don't have IRIX anymore, but I recall the SGI compiler to have been very good about pointing out possible bugs as general warnings.
Jeff