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    <h3>Common Causes</h3> <p>The common causes for "Undefined symbols for architecture armv7" are:</p> <ol> <li><p>You <strong>import a header and do not link against the correct library</strong>. This is common, especially for headers for libraries like QuartzCore since it is not included in projects by default. To resolve:</p> <ul> <li><p>Add the correct libraries in the <strong><em><code>Link Binary With Libraries</code></em></strong> section of the <strong><em><code>Build Phases</code></em>.</strong></p></li> <li><p>If you want to add a library outside of the default search path you can include the path in the <strong><em><code>Library Search Paths</code></em></strong> value in the Build Settings and add <br/><code>-l{library_name_without_lib_and_suffix}</code> (eg. for libz.a use <code>-lz</code>) to the <strong><em><code>Other Linker Flags</code></em></strong> section of <strong><em><code>Build Settings</code></em></strong>.<br/><br/></p></li> </ul></li> <li><p>You <strong>copy files into your project but forgot to check the target to add the files to</strong>. To resolve:</p> <ul> <li>Open the <strong><em><code>Build Phases</code></em></strong> for the correct target, expand <strong><em><code>Compile Sources</code></em></strong> and add the missing <code>.m</code> files. If this is your issue please upvote <a href="https://stackoverflow.com/a/10170293/418715">Cortex's answer below</a> as well.<br/><br/></li> </ul></li> <li><p>You <strong>include a static library that is built for another architecture</strong> like i386, the simulator on your host machine. To resolve:</p> <ul> <li><p>If you have multiple library files from your libraries vendor to include in the project you need to include the one for the simulator (i386) and the one for the device (armv7 for example).</p></li> <li><p>Optionally, you could create a <a href="https://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4">fat static library</a> that contains both architectures.</p></li> </ul></li> </ol> <p><br/></p> <hr> <h3>Original Answer:</h3> <p>You have not linked against the correct libz file. If you right click the file and reveal in finder its path should be somewhere in an iOS sdk folder. Here is mine for example</p> <blockquote> <p>/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib</p> </blockquote> <p>I recommend removing the reference and then re-adding it back in the Link Binary With Libraries section Build Phases of your target.</p>
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    1. COIt may also be because you need to add the word "-licucore" in project settings / Other Linker Flags. It was added automatically for my debug build but not the release one so wouldn't compile.
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    2. COI had the same issue. Didn't really read the install notes properly so hadn't noticed that the new version of bugsense needs libz binary added in the build phases.
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    3. COAre you sure that you've included an @implementation section in your respective .m file for all classes you've declared in your header file?
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