Log Message:
Update from version 0.27 to 0.31.

Pkgsrc changes:
 o Note that we need a C compiler to build

Upstream changes:

0.31    2009-02-19 23:50 UTC
        + Doc : A somewhat better introduction. The FUNCTION section was moved
                before CONSTANTS and HISTORY since it's more important. And
                'assignation' is really 'assignment', says Ricardo. :)
        + Fix : The op_info features are now thread safe.
        + Fix : Segfaults that occured when trying to get the op name during
                global destruction.
        + Fix : Segfaults and wrong "Unknown error" exceptions that \ 
happened
                when dieing in require caused a free callback to fire.
                Thanks Florian Ragwitz for reporting.

0.30    2009-02-12 17:05 UTC
        + Add : You can now get in all the callbacks either the name or a B::OP
                object representing the current op if you pass the new 'op_info'
                option to wizard() with respective values VMG_OP_INFO_NAME and
                VMG_OP_INFO_OBJECT.
        + Doc : Document magic on array/hashes values.
        + Fix : Completely skip free callbacks during global destruction.
        + Tst : Tests now pass again on 5.8.3 and lower (they were broken since
                0.27).
        + Tst : Test magic on symbol table and on array/hash values.

0.29    2009-02-08 11:10 UTC
        + Add : Set $_[2] to the default length for len magic on scalars.
        + Chg : Perl 5.8 is required.
        + Chg : The CLONE method will no longer be defined for non-threaded
                perls.
        + Doc : Nits.
        + Fix : The logic for turning off the GMAGICAL flag on hashes when no
                uvar magic is involved could do nasty things on tied hashes.
        + Upd : More resources in META.yml.

0.28    2009-01-24 17:05 UTC
        + Add : The 'copy_key' option to wizard(), that enables the safe edition
                of $_[2] in uvar callbacks to redirect actions to another key.
        + Fix : Exception objects thrown from callbacks at compile time were not
                available in $@.
        + Fix : free callbacks triggered during global destruction could lead to
                segfaults because the wizard was already freed.
        + Fix : Refcount of scalars with free callback.
        + Fix : Segfaults when using get or uvar magic simultaneously with clear
                magic.
        + Doc : The documentation about what the callbacks take and should
                return is now somewhat clearer.