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    <p>I've also had this issue.</p> <p>I've found out that it is because Eclipse couldn't find all include headers.</p> <h3>Easy fix:</h3> <p>This simple and quick solution might fix your problem (for example, when the Eclipse project was moved to a different location on disk, then imported again in Eclipse), if not, jump to the next section (<em>Detailed fix</em>). </p> <ol> <li>Go to project > properties > <strong>C/C++ Build</strong> > <strong>Tool Chain Editor</strong></li> <li>Change the <strong>Current toolchain</strong> to any other value, click <strong>Apply</strong></li> <li>Set the <strong>Current toolchain</strong> to the original value, click <strong>Apply</strong></li> <li>Compile your project</li> </ol> <h3>Detailed fix:</h3> <p>Before proceeding check if your toolchain is properly installed.</p> <ol> <li>Switch to a new workspace.</li> <li>Remove .cproject file and the ".settings" folder</li> <li>Import your project as Makefile project (or just create a new if you prefer CDT Build system)</li> <li>Go to project-> properties->C/C++ Build->Toolchain editor. Choose your toolchain.</li> <li>Press project->Index->Rebuild</li> <li>If the problem isn't resolved, change system language to English and try the above steps again.</li> </ol> <h3>Outdated answer:</h3> <p><em>This answer has been outdated. Proceed if nothing of the above helps</em></p> <p>If the previous steps don't help we'll need to setup include directories manually (not recommended though)</p> <ol> <li>Search all unresolved headers using "Right click on Project > Index > Search for unresolved includes".</li> <li>Search their locations using "find /usr/include/ -name vector -print"</li> <li>Put include folder paths to "Right click on Project > Properties > C++ General/Path and Symbols/C++"</li> <li>Run "Right click on Project > Index > Rebuild"</li> <li>Start from step 1 if there are any unresolved symbols left.</li> </ol>
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