```
- Use posix_openpt(2) instead of opening /dev/ptmx which requires
loading an extra kernel module on FreeBSD 10.0+
- Add LICENSE_FILE
- Remove the unnecessary KMODDIR knob
PR: 217880
Approved by: ??? (mentor), maintainer timeout (2 weeks+)
Differential Revision: https://reviews.freebsd.org/D?????
```