1、gcc 4.8
cd /etc/yum.repos.d wget http://people.centos.org/tru/devtools-2/devtools-2.repo yum install devtoolset-2-gcc yum install devtoolset-2-binutils yum install devtoolset-2-gcc-gfortran yum install devtoolset-2-gcc-c++
source /opt/rh/devtoolset-2/enable
2、gcc 4.9
yum install centos-release-scl-rh centos-release-scl yum check-update yum install devtoolset-3-gcc devtoolset-3-gcc-c++ source /opt/rh/devtoolset-3/enable
3、gcc 5.2
yum install centos-release-scl-rh centos-release-scl yum check-update yum install devtoolset-4-gcc devtoolset-4-gcc-c++ source /opt/rh/devtoolset-4/enable
ref: http://mirror.centos.org/centos/6/sclo/