Recently we upgraded security/openconnect to version 8.02 in bug 234839. None of us actually paid attention to the release notes which noted a dependency on a new feature in vpnc-scripts, so that needs to be updated. The latest upstream tarball is ftp://ftp.infradead.org/pub/vpnc-scripts/vpnc-scripts-20190117.tar.gz. I've updated/installed the port locally and it works fine, at least with OpenConnect.
A commit references this bug: Author: zi Date: Thu Jan 24 13:58:29 UTC 2019 New revision: 491094 URL: https://svnweb.freebsd.org/changeset/ports/491094 Log: - Update to 20190117 PR: 235172 Submitted by: John Hood <cgull+l-freebsd-bugzilla@glup.org> Changes: head/sysutils/vpnc-scripts/Makefile head/sysutils/vpnc-scripts/distinfo