Created attachment 154742 [details] patch Added immediate dependencies to port: openssl and boost-libs.
Created attachment 154743 [details] poudriere log
Missing dependency like that causes port to build differently: on system with pre-installed openssl it will link to its shared library, and on system without openssl it will link to base openssl. As a result, these packages will be incompatible. Latter package can't be installed on the former system.
Maintainer timeout.
Another bug report updated version to 3.2.0 that includes this patch here
For reference, the superseding issue was bug 200108 Also cleanup post close.