PERL5_DEFAULT != PERL5_DEFAULT depending on 'pwd'

[Harry Schmalzbauer]

 Bezüglich Harry Schmalzbauer's Nachricht vom 02.03.2017 19:30 (localtime):
>  hello,
>
> currently I'm trying to track the following problem:
>
> : cd /usr/ports/print/texinfo && make -VPERL5_DEFAULT
> 5.24
>
> : cd /usr/ports/lang/perl5.24/ && make -VPERL5_DEFAULT
> 5.20
>
> ???
> Any hints?

direct caus was the file /tmp/PERL5_DEFAULT, which contained
PERL5_DEFAULT=5.20.

But I have absolutely no idea why/how this was created and why it only
affects when pwd=lang/perl5.??

Still investigating....

-harry