<p>Nice catch, I think we should integrate the tutorials code into the build process to avoid such a situation.</p>
<p>So, I think what happens here is that once mlpack is build, the<code>mlpack_export.h</code> isn't in the right location. Right now I'm not completely sure this is the right way to solve the issue, however here is a simple fix that should work:</p>
<p>Add the following to the <code>src/mlpack/CMakeLists.txt</code> after line 33.</p>
<pre><code>FILE(COPY
${CMAKE_CURRENT_BINARY_DIR}/mlpack_export.h
DESTINATION
${CMAKE_SOURCE_DIR}/src/mlpack/)
</code></pre>
<p>Change <code>#include <mlpack_export.h></code> to <code>#include <mlpack/mlpack_export.h></code> in all files that include the header (<a href="https://github.com/mlpack/mlpack/search?utf8=%E2%9C%93&q=mlpack_export.h&type=Code">https://github.com/mlpack/mlpack/search?utf8=%E2%9C%93&q=mlpack_export.h&type=Code</a>).</p>
<p>Maybe someone else has a better solution to solve the issue?</p>
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