Using Perl 5.8.8

[rihad]

Hi, one of the programs I'm using (freeradius' rlm_perl) segfaults with 
both Perl 5.8.9 and 5.10, only working with 5.8.8. How can I cleanly 
install Perl 5.8.8 on a fresh system, without mangling the port 
Makefile? I've tried putting both USE_PERL=5.8.8 and PERL_VERSION=5.8.8 
in /etc/make.conf, but "make fetch" still tries to fetch version 5.8.9.

Thanks.