The port sets WITH_DEBUG=yes, which generates giganormous packages with debug informations. It should not be required, so it should be removed.
A commit references this bug:
Date: Mon Jun 11 12:01:00 UTC 2018
New revision: 472187
Remove inconditionnal WITH_DEBUG.
mongodb works just fine without it, and it leads to packages that are 10
times bigger than needed.
Submitted by: mat
Sponsored by: Absolight