如何解决此gRPC安装问题？

Im following these steps to install gRPC on my freshly launched AWS EC2 Instance:

https://jitpaul.blog/2018/04/18/grpc-on-aws/

When I try to execute this line:

sudo yum install libgflags-dev libgtest-dev

I get this error:

I don't want to mess up anything, please help.

Try instead:

sudo yum install gflags-dev
sudo yum install gtest-dev

That should install libgflags-dev and libgtest-dev.