Makefile question / new port for dovecot fts-plugin

Hello,

While creating a new port 
(https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261766), I attempted 
to get portlint to not complain about anything.
However, even though I tried to follow the order as found here:
https://docs.freebsd.org/en/books/porters-handbook/order/

portlint always warns about the ordering of the *_DEPENDS variables.
If someone could kindly explain how the Makefile needs to be structured 
to avoid these warnings?

Also, any and all advice, feedback, etc. on the port as such is very 
welcome.

Thanks,

Martin Waschbüsch