```
As mentioned in this special status report[1] from EuroBSDCon 2013,
WITH_SSP_PORTS was relevant in the FreeBSD 9 and FreeBSD 10 days. Nowadays,
-fstack-protector is set by default. Relevant knobs and variables are
documented in ports/Mk/bsd.port.mk.
WITH_GHOSTSCRIPT_VER was part of USE_GHOSTSCRIPT, which is deprecated.
[1]: https://www.freebsd.org/news/status/report-2013-09-devsummit.html#Ports-and-Packages
```