error: Failed dependencies: cloog-ppl >= 0.15 is needed by gcc-4.4.7-4.el6.x86_64 cpp = 4.4.7-4.el6

CentOS 6.5下使用rpm -ivh gcc-4.4.7-4.el6.x86_64.rpm命令安装GCC时提示以下错误：

warning: gcc-4.4.7-4.el6.x86_64.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
error: Failed dependencies:
	cloog-ppl >= 0.15 is needed by gcc-4.4.7-4.el6.x86_64
	cpp = 4.4.7-4.el6 is needed by gcc-4.4.7-4.el6.x86_64

开始只知道是缺少依赖项，但具体缺少什么没看明白，

使用yum安装的时候都会把依赖项完整的列出来；

后来才看明白，

cloog-ppl 需要大于等于 0.15 版本的

cpp 需要 4.4.7-4.el6 版本的

看懂错误信息就好说了。

rpm -ivh cloog-ppl-0.15.7-1.2.el6.x86_64.rpm 
warning: cloog-ppl-0.15.7-1.2.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID c105b9de: NOKEY
Preparing...                ########################################### [100%]
   1:cloog-ppl              ########################################### [100%]

rpm -ivh cpp-4.4.7-4.el6.x86_64.rpm 
warning: cpp-4.4.7-4.el6.x86_64.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
Preparing...                ########################################### [100%]
   1:cpp                    ########################################### [100%]

rpm -ivh gcc-4.4.7-4.el6.x86_64.rpm 
warning: gcc-4.4.7-4.el6.x86_64.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
Preparing...                ########################################### [100%]
   1:gcc                    ########################################### [100%]