IO.xs:208: `sv_undef' undeclared (first use in this function)
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That looks like you're trying to compile an older version from when perl's symbols were `exported' by default. All of perl's symbols are prefixed with `PL_' now days (e.g. sv_undef is now really PL_sv_undef so that perl doesn't clog up your C namespace).

If you've got an older XS module and get errors like this try adding POLLUTE=1 to your Makefile.PL arguments when you run it. See perldoc perlmodinstall and perldoc ExtUtils::MakeMaker for more details.