How to solve QCAR libray not found? on building for iOS

Ld /Users/jeduardoelias/Library/Developer/Xcode/DerivedData/Unity-iPhone-cjiskcqgiplkoebkwqjwweayyeqv/Build/Intermediates/ArchiveIntermediates/Unity-iPhone/IntermediateBuildFilesPath/Unity-iPhone.build/Release-iphoneos/Unity-iPhone.build/Objects-normal/armv6/catorce normal armv6 cd /Users/jeduardoelias/Desktop/Programacion/itunes/pruebavideoseis setenv IPHONEOS_DEPLOYMENT_TARGET 3.1.3 setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch armv6 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk -L/Users/jeduardoelias/Library/Developer/Xcode/DerivedData/Unity-iPhone-cjiskcqgiplkoebkwqjwweayyeqv/Build/Intermediates/ArchiveIntermediates/Unity-iPhone/BuildProductsPath -F/Users/jeduardoelias/Library/Developer/Xcode/DerivedData/Unity-iPhone-cjiskcqgiplkoebkwqjwweayyeqv/Build/Intermediates/ArchiveIntermediates/Unity-iPhone/BuildProductsPath -filelist /Users/jeduardoelias/Library/Developer/Xcode/DerivedData/Unity-iPhone-cjiskcqgiplkoebkwqjwweayyeqv/Build/Intermediates/ArchiveIntermediates/Unity-iPhone/IntermediateBuildFilesPath/Unity-iPhone.build/Release-iphoneos/Unity-iPhone.build/Objects-normal/armv6/catorce.LinkFileList -dead_strip -all_load -weak_framework CoreMotion -weak-lSystem -Wl,-S,-x -fobjc-link-runtime -miphoneos-version-min=3.1.3 -framework Security -framework Foundation -framework UIKit -framework OpenGLES -framework QuartzCore -framework OpenAL -liconv.2 -lQCAR -lQCARUnityPlayer -lVuforiaMedia -liPhone-lib -framework AudioToolbox -framework CFNetwork -framework MediaPlayer -framework CoreLocation -framework SystemConfiguration -weak_framework iAd -framework CoreMedia -framework CoreVideo -weak_framework AVFoundation -framework CoreGraphics -weak_framework CoreMotion -weak_framework GameKit -o /Users/jeduardoelias/Library/Developer/Xcode/DerivedData/Unity-iPhone-cjiskcqgiplkoebkwqjwweayyeqv/Build/Intermediates/ArchiveIntermediates/Unity-iPhone/IntermediateBuildFilesPath/Unity-iPhone.build/Release-iphoneos/Unity-iPhone.build/Objects-normal/armv6/catorce

ld: library not found for -lQCAR clang: error: linker command failed with exit code 1 (use -v to see invocation)

I cant compile for making the archive in XCODE 4 it always gives me this error, can anyone help me solving it? it always stops when making the linking process. Thanks