> Processing Dependency: centos-release-scl-rh for package: > Package centos-release-scl.noarch 0: will be installed Loading mirror speeds from cached hostfile Here is the output in our ~]# yum -y install centos-release-scl So here is how to install GNU GCC 7: STEP 1) Install the repository in your system This article is to install GNU GCC 7 on CentOS 7 and we have a new one to install GNU GCC 8 – How to install GNU GCC 8 on CentOS 7. To have a newer version of the same components, you can have multiple version of GNU GCC – you can install with no worries of breaking your system GNU GCC 6 and 7.Not only GNU GCC, but you can also have PHP, Ruby, Python, famous databases like Mysql, MongoDB, PostgreSQL and many more
Multiple version installed of the same components, you can have multiple GNU GCC installed without breaking your system or compiling manually. We can say these packages are officially maintained by CentOS 7 team and as a whole Red Hat/CentOS officials and community developers! The collection aims at There are repositories, which would surely break your system at one point even they do not break it at first installing a newer version of GNU GCC! There is a really easy and “official” way to have newer development software in CentOS 7 by using the Software Collection – It offers us free enterprise-class operating system, which is compatible with Red Hat, but in many situations, we need a newer (not even a bleeding edge) tools from a trusted source not from an unknown third repository! Let’s say you are a developer and you need newer than GCC 4.8 (which is more than 5 years old and at present, we have stable GCC 8.x stable branch). 
CentOS 7 is a very stable and conservative operating system.
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