Command /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/

今天在下载一个Demo编译时，提示如下错误

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ld: library not found for -lz.1.2.3

collect2: ld returned 1 exit status

Command /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-gcc-4.2 failed with exit code 1



lz.1.2.3指的是libz.1.2.3.dylib动态库文件，这是因为iOS5以后，也就是xcode4.2以后就没有libz.1.2.3.dylib了，取而代之是libz.1.2.5.dylib；

解决办法:删除libz.1.2.3.dylib，添加libz.1.2.5.dylib，运行成功，如果直接在原来工程上添加libz.1.2.5.dylib，仍会编译错误，所以要删除libz.1.2.3.dylib；