Github user olegz commented on the issue:
https://github.com/apache/nifi/pull/397
True, and I did the same ('brew install tesseract') and got this
```
Trying a mirror...
==> Downloading
ftp://ftp.simplesystems.org/pub/libpng/png/src/libpng16/libpng-1.6.17.tar.xz
curl: (78) RETR response: 550
Error: Failed to download resource "libpng"
Download failed:
ftp://ftp.simplesystems.org/pub/libpng/png/src/libpng16/libpng-1.6.17.tar.xz
```
So, I'll keep on trying
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