您好，我无法安装 fdesc，这是输出
root@nshost2:~ # mount -t fdescfs fdesc /dev/fd
mount: fdesc: Operation not supported by device
这是输出dmesg
root@nshost2:~ # dmesg | grep fdesc
KLD fdescfs.ko: depends on kernel - not available or version mismatch
并kldstat输出
root@nshost2:~ # kldstat
Id Refs Address Size Name
1 22 0xffffffff80200000 1755638 kernel
2 1 0xffffffff81956000 11958 carp.ko
3 1 0xffffffff81968000 5e578 if_bce.ko
4 1 0xffffffff819c7000 14810 if_lagg.ko
5 1 0xffffffff81c11000 357e ums.ko
6 3 0xffffffff81c15000 32efe pf.ko
7 1 0xffffffff81c48000 807e pfsync.ko
8 1 0xffffffff81c51000 26c5 pflog.ko
9 1 0xffffffff81c54000 6381 nullfs.ko