Ok, my advice is then to install ROOT’s dependencies using yum, then compile and install like this:
root $ mkdir build && cd build
build $ cmake .. -Drpath=ON -DCMAKE_INSTALL_PREFIX=/opt/root/<version> -CCMAKE_CXX_STANDARD=17 ...
build $ cmake --build .
build $ cmake --build . --target install
After that, rather than source thisroot.sh, just do
export PATH=$PATH:/opt/root/<version>/bin
export PYTHONPATH=$(root-config --libdir)
in the shell where you want to use ROOT, not on your .bashrc. That way you make sure not to mix up different versions of ROOT.
If you need to compile against a specific version of ROOT, use cmake -DCMAKE_PREFIX_PATH=/opt/root/<version> -DCMAKE_C_COMPILER=$(root-config --cc) -DCMAKE_CXX_COMPILER=$(root-config --cxx) ... when configuring your own project.