You don't, unless you turn off strict refs:

# since strict is a lexical pragma you can put it in a block and let
# it return to its former state when you leave the block.
{
    no strict refs;

    # do something that might be ill-advised
    ...
}
[download]

This is, in my experience, most commonly done to auto-generate accessor methods. But turning off strict refs is generally frowned upon. That is why I suggested using a hash to store the names as keys that can be computed.