只要安装这5个包即可
compat-libgcc-296-2.96-138
gcc-c++-4.1.2-55.el5
libgcc-4.1.2-55.el5
gcc-4.1.2-55.el5
libgcc-4.1.2-55.el5
查看安装的软件版本号及位数
yum list | grep gcc
结果如下：installed 为安装的 ，base 为未安装的
compat-libgcc-296.i386 2.96-138 installed
gcc.x86_64 4.1.2-55.el5 installed
gcc-c++.x86_64 4.1.2-55.el5 installed
libgcc.i386 4.1.2-55.el5 installed
libgcc.x86_64 4.1.2-55.el5 installed
compat-gcc-34.x86_64 3.4.6-4.1 base
compat-gcc-34-c++.x86_64 3.4.6-4.1 base
compat-gcc-34-g77.x86_64 3.4.6-4.1 base
gcc-gfortran.x86_64 4.1.2-55.el5 base