安装过程没有出现出错的信息，安装完了，
运行了mysql_install_db
再运行 safe_mysqld,了，出现如下出错信息，
Starting mysqld daemon with databases from /usr/mysql/var
020620 14:51:32 mysqld ended
查看mysql目录下var目录下的email.err文件，如下
020612 11:38:56 mysqld started
020612 11:38:56 /usr/mysql/libexec/mysqld: Can't create/write to file '/usr/mysql/var/email.pid' (Errcode: 13) //主机名为email
020612 11:38:56 /usr/mysql/libexec/mysqld: Can't find file: './mysql/host.frm' (errno: 13)
020612 11:38:56 /usr/mysql/libexec/mysqld: Error on delete of '/usr/mysql/var/email.pid' (Errcode: 13)
020612 11:38:56 mysqld ended
为什么会出现如下情况呢，请高手指正，
要添加mysql用户及组，具体用法如下
shell> ./configure --prefix=/usr/local/mysql
shell> make
shell> make install
shell> scripts/mysql_install_db
shell> chown -R root /usr/local/mysql
shell> chown -R mysql /usr/local/mysql/var
shell> chgrp -R mysql /usr/local/mysql
shell> cp support-files/my-medium.cnf /etc/my.cnf
shell> /usr/local/mysql/bin/safe_mysqld --user=mysql &