+# Standard system options
+options SWAPPAGER # swap pager (anonymous and swap space)
+options VNODEPAGER # vnode pager (mapped files)
+options DEVPAGER # device pager (mapped devices)
+options DIAGNOSTIC # extra kernel debugging checks
+options DEBUG # extra kernel debugging support
+options "COMPAT_43" # compatibility with 4.3BSD binaries
+options KTRACE # system call tracing support
+options "NKMEMCLUSTERS=1024" # 4K pages in kernel malloc pool
+options KGDB # support for kernel gdb
+options "KGDBRATE=19200" # kernel gdb port rate (default 9600)
+#options "KGDBDEV=15*256+0" # device for kernel gdb
+
+# Filesystem options
+options FIFO # POSIX fifo support (in all filesystems)
+options FFS,QUOTA # fast filesystem with user and group quotas
+options MFS # memory-based filesystem
+options NFS # Sun NFS-compatible filesystem
+options "CD9660" # ISO 9660 (CDROM) filesystem
+options UNION # Union filesystem
+options KERNFS # kernel data-structure filesystem
+options FDESC # user file descriptor filesystem
+options PROCFS # /proc filesystem
+#options UMAPFS # uid/gid remapping filesystem
+#options NULLFS # null layer filesystem
+#options LFS # Log-based filesystem (still experimental)
+#options PORTAL # portal filesystem (still experimental)
+
+# Networking options
+options INET # Internet protocols
+options "TCP_COMPAT_42" # compatibility with 4.2BSD TCP/IP
+options GATEWAY # IP packet forwarding
+#options MULTICAST # Multicast support
+#options MROUTING # Multicast routing support
+#options ISO # OSI networking