Problems while building CERN ROOT form source (gmake: *** [all] Error)

ROOT
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Thanks. What’s the output of rm CMakeCache.txt; cmake -DCMAKE_INSTALL_PREFIX=../root-6.20.04/install-root /root-6.20.04? Can you attach it?

Alternatively you might be able to simply untar https://root.cern/download/root_v6.22.02.Linux-centos7-x86_64-gcc4.8.tar.gz and use that!