officially usable PERL5_* variables?

[Klaus Heinz <k.heinz.maer.sieben%kh-22.de@localhost>]

Hi,

can all the variables in pkgsrc/lang/perl5/vars.mk beginning with
PERL5_ and PERL5_SUB_ be considered as part of the official interface
for Perl modules?

I would like to shut up a "check-interpreter" test.

ciao
     Klaus