Due to the age of centos 6 and the lack of support. A third party repository is required in order to fetch all the updated packages needed to run the 7 series of the platform.
Stu has suggested that this be included in the Installation and Running book.
The following file needs to be added to the system: /etc/yum.repos.d/devtools-2.repo
And should contain the following information:
name=testing 2 devtools for CentOS 6
Then using yum install hpccsystems-platform should work properly.