Github user olegz commented on the issue:
https://github.com/apache/nifi/pull/397
Ok, while all is good on Windows I can't seem to have any success building
those _.so_ files on OSx. Normally I would not worry about it that much but
given that Tesseract distribution includes DLLs inside the JAR means that for
"all other" OS such native libraries will come from outside and need to be
known to the processor, so we probably would need another property and
definitely test with at least one non-Win system.
So, I'll keep on trying (when I get a chance) to get/build those native
libraries, but could use some help here as well
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