PL/PERL with composite return values & PGSQL 7.4?

"Philippe Lang" <philippe.lang@attiksystem.ch> writes:

Documentation mentions that PGSQL 8 supports a version of PL/PERL with
composite return values. Is there a way to install this new version of
PL/PERL on an old 7.4 database,

No. The rest of it might work, but not that feature, at least not
without significant rewrite. We changed the underlying mechanisms
for handling composite-valued functions in 8.0 ...

regards, tom lane