I think the error message would begin "util.c:" instead of "Util.c:". You'll find the source module in /usr/src/gnu/usr.bin/perl.
Since this is repeatable, you might reach out to the port's maintainer, Pierre-Emmanuel Andre. You'll find his Email address with pkg_info(1), such as $ pkg_info postgresql-client .
I can't provide any actual help, though. I'm not a Perl programmer and I have never used PostgreSQL perl extensions.
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