cmake --build . -j $(nproc)

[root]

OS: Linux Mint 19.3
GCC: 7.4.0

That line didn't fly. The -j switch in

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cmake --build . -j $(nproc)

wasn't accepted. So I just went on to the next/last line

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sudo cmake --build . --target install

The installation's at 25% and still going.

How important was

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cmake --build . -j $(nproc)

to the process?

[root]

Nevermind. I was following the wrong game plan. Got it right now; following the wiki.