g++ is often necessary for building various packages. But It’s quite hard to install it in CentOS if you don’t know a simple thing: yum install g++ will not work here. yum install compat-g++and yum install gcc-g++ won’t give any result too.  The only command for yum to install g++ on CentOS is the following:

yum install gcc-c++

You might also want to install it with some more useful packages. Then your command will be:

yum install gcc-c++ compat-gcc-32 compat-gcc-32-c++

Hope this helps you to install g++ under CentOS

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