or download this
pod/perldeltas.html#p5180-Incompatible_Changes
pod/perldeltas.html#p5163-Incompatible_Changes
...
pod/perldeltas.html#p5101-Incompatible_Changes
pod/perldeltas.html#p5101-Other_incompatible_changes
pod/perldeltas.html#p5100-Incompatible_Changes