I'm not sure of the history of this bug, but it seems not to have
attracted much intersted from porters in the last decade or so
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=559639
It may be hopeless, but if someone with a particular interest in hppa
wants to tackle it, please follow up on the bug. I am nearly certain
that the underlying issue is different now, since racket has changed a
lot in the meantime.
d