Variables
---------

* The :variable:`BSD` variable is set to a string value when the target system is BSD.
  This value can be one of the following: DragonFlyBSD, FreeBSD, OpenBSD, or NetBSD.

* The :variable:`CMAKE_HOST_BSD` variable is set to a string value when the host system is BSD.
  This value can be one of the following: DragonFlyBSD, FreeBSD, OpenBSD, or NetBSD.