When running minicom as a user in the dialout group I now get an error message that it cannot create a lock file.  This worked in 15.5.  Minicom is attempting to create the lockfile in /run/lock but only root has write access to this directory.  Minicom uses lockdev which requires access to /var/lock.

One way to fix this is to build minicom without lockdev.  Lockdev is fundamentally broken because it requires write access to /run/lock, which is a security nightmare.  When minicom is built without lockdev the location of the lockfiles can be specified to be someplace other than /var/lock.

See https://systemd-devel.freedesktop.narkive.com/vCJLfMo2/headsup-var-lock-and-var-lock-lockdev for a discussion.

As an interim solution, I added an ACL to allow the dialout group to write to /run/lock, though this is far from ideal.