CentOS 4.8 yum update fail and solution

Reference:
http://www.linuxquestions.org/questions/linux-software-2/help-centos-here-4-8-final-946734/

CentOS 4.8 yum update subversion error message:

not using ftp, http[s], or file for repos, skipping - 4 is not a valid release or hasnt been released yet
Cannot find a valid baseurl for repo: update
Error: Cannot find a valid baseurl for repo: update

Solution:
1. edit /etc/yum.repos.d/CentOS-Base.repo
2. add baseurl=http://vault.centos.org/4.9/updates/$basearch/

結果：
subversion 可以更新，但是... 只更新到 subversion-1.1.4-4.el4_8。因為 CentOS 4.8 已經不維護了，這樣的更新就沒意義了。
還是自己抓 subversion for CentOS 4.x RPM回來安裝吧。