Perl 5..6.0

[Hookway, Ray]

I am trying to build an extension under Perl 5.6.0 which I believe works
under earlier versions of Perl. Several of the c source files won't compiler
and complain about undefined variables (e.g., na and errgv). I have found
these are defined in embedvar.h if PERL_POLLUTE is defined. There is also a
comment to the effect that "this is disabled by default in 5.6.0". What do I
need to do to get the extension to compile under 5.6.0?

Thanks.

-Ray Hookway