Xcode 4.2 link error: libz issue?

Question

Moving a project to Xcode 4.2, I am getting a number of Mach-O linker unresolved errors, for things like _crc32, _expf, and _UnwindSjLj_Register, on a project that compiles

Answer 1

I had same problem. it works xcode 4.2 .when i run the app in xcode 4.5. I have this problem. libz.dylib (No such file or directory)Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool failed with exit code 1. I have tried with libz1.2.5dylib.but no use