ebuilds 2.0.5 (stable for amd64) and 2.1.7 do not allow to build friradius enabled dhcp (option --with-dhcp for configure script). The best would be to add an additional flag to toggle dhcp Reproducible: Always
*** Bug 401797 has been marked as a duplicate of this bug. ***
Okay I'm going to look into these and most likely fix them with 2.2.0.
Resolved in 2.2.0, support enabled by default now.