buildsyspkg FEATURE is described neither in make.conf.5.gz (`man make.conf`) nor in make.conf.example (/etc/make.conf.example).
This has been released in 2.1.2_pre1-r1.
Is /etc/make.conf.example unmaintained?
Created attachment 98437 [details] make.conf.example /etc/make.conf.example
Created attachment 98438 [details] /etc/make.conf.example
make.conf.example is not a manpage, it's an example if you want a manual, read the manpage