Trying to install MailScanner. Getting error

Hello, I am trying to do an install of Exim 4.20 + MailScanner + Clam AV Full Guide for Cpanel 7.x via this tutorial.
http://www.cpanelplus.com/staticpage...03073009541160 When I do the // Install MailScanner
./install.sh
comand. I get this error.

Good. You have the patch command.

Your /usr/src/redhat, /usr/src/RPM or /usr/src/packages
tree is missing.
If you have access to an RPM called rpm-build
install it first and come back and try again.

Can anyone tell me what this means and what I need to do to be able to finish this install?

Thanks

KevinTrying to install MailScanner. Getting error

 

 

 

 

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