最近在linux下装extmail，看文档不明白这是什么意思，帮忙翻译下
yum install gcc ncurses-devel rpm-build libtool pam-devel gcc-c++ gdbm-devel redhat-rpm-config libidn-devel pcre-devel expect



还麻烦帮看下这错误，是没装httpd吗

chkconfig --level 345 httpd on
error reading information on service httpd: No such file or directory

service httpd start
httpd: unrecognized service
[解决办法]
yum -y install httpd