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Run sudo make install. The PREFIX controls installation path, which is /usr/local/bin by default.
sudo make install
PREFIX
/usr/local/bin
spark [-h|--help] [number] ...
[joursoir@arch ~]$ spark 0 97 77 71 13 28 34 41 91 8 ▁█▆▆▂▃▃▄▇▁