1.yum不可用，无法安装gcc，因此需要配置yum源
2 .删除原始的/etc/yum.conf文件和/etc/yum.repo.d目录
rm -rf /etc/yum.conf
RM-RF/etc/yum.repos.d/rhel-debug info.repo
重新配置yum.conf
cachedir=/var/cache/yum
keepcache=1
调试级别=2
logfile=/var/log/yum.log
distroverpkg=redhat-release
种子=1
exactarch=1
obsoletes=1
gpg检查=1
plugins=1
元数据_ expire=1800
# putyourreposhereorinseparatefilesnamedfile.repo
# in /etc/yum.repos.d
name=centos-5 - Base
base URL=http://centos.ustc.edu.cn/centos/5/OS/i386 /
# the other site :http://centos.candis hosting.com.cn/centos/5/OS/i386 /
# youcanfindmoresitein :http://www.centos.org/modules/tiny content/index.PHP？ id=13
启用=1
gpg检查=1
#已发布更新
name=centos-5 -更新
base URL=http://mirror.centos.org/centos/5/updates/i386 /
gpg检查=1
# packages used/producedinthebuildbutnotreleased
name=CentOS-5 - Addons
base URL=http://mirror.centos.org/centos/5/addons/$ basearch /
gpg检查=1
# additionalpackagesthatmaybeuseful
name=CentOS-5 - Extras
base URL=http://mirror.centos.org/centos/5/extras/$ basearch /
gpg检查=1
# additionalpackagesthatextendfunctionalityofexistingpackages
name=CentOS-5 - Plus
base URL=http://mirror.centos.org/centos/5/centos plus/$ basearch /
gpg检查=1
启用=0
#contrib - packages by Centos Users
name=CentOS-5 - Contrib
base URL=http://mirror.centos.org/centos/5/contrib/$ basearch /
gpg检查=1
启用=0
#packages in testing
name=CentOS-5 - Testing
base URL=http://mirror.centos.org/centos/5/testing/$ basearch /
gpg检查=1
启用=0
4 .然后测试安装就可以了
yum clean all
yum list
yum -y install gcc gcc-g友好之星/p