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%]
error: Failed dependencies: cloog-ppl >= 0.15 is needed by gcc-4.4.7-4.el6.x86_64 cpp = 4.4.7-4.el6
原文：http://blog.csdn.net/testcs_dn/article/details/41727601