当我跑步时sudo systemctl start httpd.service，我得到了这个。
apachectl[18382]: httpd: Syntax error on line 172 of /etc/httpd/conf/httpd.conf: Cannot load modules/libphp5.so into server: /etc/httpd/modules/libphp5.so: undefined symbol: unixd_config
环境：Archlinux 3.10.10.1 x86_64 + php5.5.3 + 来自 AUR 的 apache24。