Nothing happens if I type in echo $TESSDATA_PREFIX

I thought about installing tesseract 4.0beta, is there a step-by-step-guide 
how to do this? with brew install tesseract I cannot choose the version, 
i.e. it's 3.05.01

Am Dienstag, 10. April 2018 15:07:18 UTC+2 schrieb Fanatico:
> You installed it using brew or compiled it yourself?
> try to type this in the terminal and post here the result

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