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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