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我正在使用CentOS机器（版本6.7）..我在这台机器上安装了php 5.6（以前是5.3），实际上我想用这个命令行安装PHP的GD库：安装GD Library for PHP 5.6
sudo yum install php56u-gd
，我怎么可能会解决这个问题，它给了我这个错误消息
Loaded plugins: fastestmirror, replace, security
Setting up Install Process
Loading mirror speeds from cached hostfile
* base: centos.mirror.gtcomm.net
* elrepo: ftp.osuosl.org
* epel: ftp.osuosl.org
* extras: centos.mirror.gtcomm.net
* ius: ius.mirror.constant.com
* remi-safe: mirrors.mediatemple.net
* rpmforge: mirror.us.leaseweb.net
* updates: centos.mirror.iweb.ca
* webtatic: us-east.repo.webtatic.com
Resolving Dependencies
--> Running transaction check
---> Package php56u-gd.x86_64 0:5.6.23-1.ius.centos6 will be installed
--> Processing Dependency: php56u-common(x86-64) = 5.6.23-1.ius.centos6 for package: php56u-gd-5.6.23-1.ius.centos6.x86_64
--> Running transaction check
---> Package php56u-common.x86_64 0:5.6.23-1.ius.centos6 will be installed
--> Processing Dependency: php56u-pecl-jsonc(x86-64) for package: php56u-common-5.6.23-1.ius.centos6.x86_64
--> Running transaction check
---> Package php56u-pecl-jsonc.x86_64 0:1.3.9-2.ius.centos6 will be installed
--> Processing Dependency: php56u-pear for package: php56u-pecl-jsonc-1.3.9-2.ius.centos6.x86_64
--> Processing Dependency: php56u-pear for package: php56u-pecl-jsonc-1.3.9-2.ius.centos6.x86_64
--> Running transaction check
---> Package php56u-pear.noarch 1:1.10.1-4.ius.centos6 will be installed
--> Processing Dependency: php56u-xml for package: 1:php56u-pear-1.10.1-4.ius.centos6.noarch
--> Processing Dependency: php56u-posix for package: 1:php56u-pear-1.10.1-4.ius.centos6.noarch
--> Processing Dependency: php56u-cli for package: 1:php56u-pear-1.10.1-4.ius.centos6.noarch
--> Running transaction check
---> Package php56u-cli.x86_64 0:5.6.23-1.ius.centos6 will be installed
---> Package php56u-process.x86_64 0:5.6.23-1.ius.centos6 will be installed
---> Package php56u-xml.x86_64 0:5.6.23-1.ius.centos6 will be installed
--> Finished Dependency Resolution
？ 感谢