This error should not suddenly appear, since File::Temp is a Perl core module. Maybe it got upgraded by installing the other module, but even then, that warning shouldn't appear.
What is your Perl version? You can find it by running perl -v.
I think that the fix should work as you posted it, but in your weird/special case, you could just remove the offending function names from the list, as they will not be defined anyway.
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