Tesseract runtime error: Error in pixReadMemPng: function not present
<p>I built Tesseract 3.04.01 on Cygwin. It can recognize .bmp files, but it fails on .png files:</p>

<pre>$ tesseract.exe testing/phototest.png output
Tesseract Open Source OCR Engine v3.04.01 with Leptonica
Error in pixReadMemPng: function not present
Error in pixReadMem: png: no pix returned
Error during processing.</pre>

<p>I thought that leptopnica added support for png?</p>