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    <p>Where have you performed your <strong>make clean</strong> ? </p> <p>If you follow <a href="http://opencv.willowgarage.com/wiki/InstallGuide" rel="nofollow">the documentation</a> correctly, you can see that it is advised to create a folder to store everything that is going to be compiled. </p> <p>Ususally, you do that by performing a </p> <pre><code>mkdir build </code></pre> <p>You should not have any problem in following <strong><a href="http://opencv.willowgarage.com/wiki/InstallGuide%20%3a%20Debian" rel="nofollow">this guide</a></strong> step by step.</p> <p>AS you can see, the cmake command is :</p> <pre><code>cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_PYTHON_SUPPORT=ON -D BUILD_EXAMPLES=ON .. </code></pre> <p>The .. at the end are very important, because it means that you should perform the command in the directory where you want everything to be built.</p> <p>If you directly ran your cmake into the source directory, you might want to unzip the package and start all over again ;). </p> <p>You were right to change the variable for CUDA, especially if you don't have an NVidia graphical card. </p> <p>The last message you indicate is a warning, not a error. And you can solve it by following what I said before. </p> <p>If you only want to use OpenCV, and not develop for it, you migh as well as Barnabas said directly use you package manager. </p> <p>In this case, <a href="https://help.ubuntu.com/community/OpenCV" rel="nofollow">follow his link</a></p>
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