GCC升级问题解决：configure: error: Building GCC requires GMP 4.2+, MPFR 2.4.0+ and MPC 0.8.0+，mpfr2.4.0完整解决

1.sudo yum install  gmp  gmp-devel  mpfr  mpfr-devel  libmpc  libmpc-devel

如果出现了上面的两个包不存在的情况（"No package XXX available"）的话就进行步骤2

2.

cd /home

wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

rpm -ivh epel-release-6-8.noarch.rpm

yum install XXX

然后进行步骤1就能进行对应的libmpc的包和libmpc扩展包的安装

3.然后进行gcc的安装具体安装参考博客：

https://blog.csdn.net/HoeWang/article/details/83654413