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What I am trying to do Integrate Zxing , QR code reader framework, in my iPhone project. I checked out ZXing sdk from here . I ran the sample project coming with ZXing, named ScanTest, without any issues. But when I try to integrate the library with my project I am getting the error mentioned. Project specification Target OS : iOS 6.0 Deployment target : iOS 5.0 or above. Tested on : iPhone 4 and iPhone 3GS. Xcode : Xcode 4.5.1 ZXing version : 2.0 Problem When I build, after doing every integration step in ZXing readme file , I am getting build errors like Undefined symbols for architecture armv7: "std::basic_ostream<char, std::char_traits<char> >& std::operator<<<std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)", referenced from: zxing::qrcode::Detector::computeDimension(zxing::Ref<zxing::ResultPoint>, zxing::Ref<zxing::ResultPoint>, zxing::Ref<zxing::ResultPoint>, float) in libZXingWidget.a(Detector-B8B28E953F840D47.o) Undefined symbols for architecture armv7: "std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)", referenced from: zxing::Exception::Exception(char const*) in libZXingWidget.a(Exception.o) zxing::common::StringUtils::guessEncoding(unsigned char*, int, std::map<unsigned int, std::string, std::less<unsigned int>, std::allocator<std::pair<unsigned int const,

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