As the successor to the deprecated databases/py-rrdtool_lgpl port , this port is intended to inherit its functionality, but comes from a different source  and is also named differently.
The original patch is from Darius, after discussion with several people (including Gleb) somewhat revised by me.
Submitted by email@example.com (new maintainer) in PR 251126.
Tested on Poudriere (amd64, i386). 'portlint -AC' is fine.