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my $output = WriteMakefile(%opts);
if (!exists $output->{EXTRALIBS} or
...
    exit 1;
}
exit 0;

     LIBS           => ["-L$POSTGRES_LIB -lpq -lm"],
...
...
    $msdir =~ s{"$}{/ms"};
    $opts{LIBS}[0] .= " -L$msdir -lsecur32";