CentOS4で、php5やmysql5をインストール出来るようにする

centos 
# vi /etc/yum.repos.d/CentOS-Base.repo

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
#enabled=0
enabled=1 ←ここを1に
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos4

#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/
gpgcheck=1
#enabled=0
enabled=1 ←ここを1に
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos4