Add missing dependency: devel/p5-Class-Accessor
re: https://metacpan.org/source/DLO/Proc-BackOff-0.02/Build.PL#L11
Encountered this error:
Base class package "Class::Accessor" is empty.
(Perhaps you need to 'use' the module which defines that package first, or make that module available in @INC (@INC contains: /usr/local/sbin/../lib /usr/local/lib/perl5/site_perl/mach/5.30 /usr/local/lib/perl5/site_perl /usr/local/lib/perl5/5.30/mach /usr/local/lib/perl5/5.30). at /usr/local/lib/perl5/site_perl/Proc/BackOff.pm line 4.