Welcome to LQ.
The package manager is `yum´.
# yum install gcc-c++
I.e. the c++ part of gcc takes care that all gcc dependencies are installed.
All tools for compiling : # yum groupinstall "Development Tools"
( Ref. $ yum grouplist )
.. compile programs that i've dowloaded the source code for.
The most software is available with 'yum' :
$ yum search <name> (or part of name)
.. to find one of the ~20,000 available packages.