Had a real problem there building my Mac projects with the latest Juce.
The problem is that I use some of my own code that links-in to the zlib library. My code couldn’t see all the symbols it needed in the zlib library.
The way that the Mac Juce project builds this in the latest system, is via some #included code in juce_GZIP*.cpp
The only way I could find to get my code to link with this, was to break this code out and directly list the zlib .c files in the project and without the zlibNamespace stuff.
Anyways, thought you should know!
With best wishes,