The

eval "require $classFile;";
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method is the one I use often. I'd name the variable $package though, because you're not actually naming the file.

I sometimes even eval a 'use', so the import get's run. Be sure to keep checking $@ afterwards though... Not doing so is asking for trouble. You may want to expand the die a bit, something like:

die "Error during dynamic require of $classFile:\n$@"
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This'll just make the error messages a bit clearer for ya...