@INCvariable (used to search for modules when your program uses them), has had '.' (the current directory) in it. But this is a security risk, so in Perl 5.26 @INC will no longer contain '.'. Ryan goes through what that might mean for your CPAN distributions, and has assembled a list of distributions that appear to break with this change. If you're an author, check for your distribution(s) please!
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