A：yum -y install gcc

A:vim /etc/yum.repo.d/XXXX.repo
将第一行的 -$basearch-debug 删除
将第二行的url=后面的内容替换为http://mirrors.163.com/centos/5/os/i386/
enbaled=0换成1
GPG-KEY修改成http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-5
保存退出(wq)
试试yum list看看是否可以使用

A：
将mirrors.163.com的IPv4地址写入到/etc/hosts
[root@localhost ~]# echo `host mirrors.163.com|cut -d' ' -f 4` mirrors.163.com >> /etc/hosts# yum clean all
# rpm --rebuilddb
# yum update

Q:重启报错：/usr/local/apache/bin/apachectl restart
httpd: Syntax error on line 152 of /usr/local/apache/conf/httpd.conf: Cannot load modules/libphp5.so into server: /usr/local/apache/modules/libphp5.so: cannot restore segment prot after reloc: Permission deniedA：
起因：SELinux保护模式引起的1、关闭SELINUX的方法:
编辑/etc/selinux/config，找到这段：
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - SELinux is fully disabled.
SELINUX=enforcing把 SELINUX=enforcing 注释掉：#SELINUX=enforcing ，然后新加一行为：
SELINUX=disabled
保存，关闭。编辑/etc/sysconfig/selinux，找到:
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - SELinux is fully disabled.
SELINUX=enforcing如果SELINUX已经是 SELINUX=disabled，那么就不用改了，否则就把SELINUX=enforcing 注释掉，新加一行：
SELINUX=disabled
保存，退出。重启如果你碰到其他类似提示：
cannot restore segment prot after reloc: Permission denied
哪应该是SELinux的问题，可以考虑把它关闭。2、不关闭SELINUX的方法:
# setenforce 0
# chcon -c -v -R -u system_u -r object_r -t textrel_shlib_t /usr/local/apache/modules/libphp5.so
# service httpd restart
# setenforce 1实验了一下确实管用apapche启动正常，php正常显示。

A：
cd /lamp/php-5.6.13/ext/gd/
../../scripts/phpize
./configure --prefix=/usr/local/php/ --with-php-config=/usr/local/php/bin/php-config
make
make installfind / -name "gd.so"
/usr/local/php/lib/php/extensions/no-debug-zts-20131226/gd.sovim /etc/php.ini
extension=/usr/local/php/lib/php/extensions/no-debug-zts-20131226/gd.so