in reply to Math::XOR ... problems with installation ...

Math::XOR has been removed from CPAN (but still exists in BackPan).

You can still browse it, or perhaps write your own using the ^ operator.

("hello" ^ "world")
    eq join "", map chr, 0x1f, 0x0a, 0x1e, 0x00, 0x0b
    or die "Different behaviour";

[download]
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In Section Seekers of Perl Wisdom