No such file or directory: Failed to enable the 'httpready' Accept Filter

FreeBSD 7.x 在啟動 Apache 2.2.x 時, 出現
[warn] (2)No such file or directory: Failed to enable the 'httpready' Accept Filter
表示沒有載入 accf_http module, 這是用來 buffer incoming connections 用的.
kldload accf_http (載入此 module)
echo 'accf_http_load="YES"' >> /boot/loader.conf (設定下次開機載入)
若自行編 Kernel, 加入 options ACCEPT_FILTER_HTTP

ref. FreeBSD: Apache httpready filter - Failed to enable the 'httpready' Accept Filter