<p>I installed mlpack in <code>Ubuntu 16.04</code> using the command : <code>sudo apt-get install mlpack-dev</code>.<br>
The installation had, in its dependencies , mlpack2 too. Now I have some mlpack code that throws this error:</p>

<pre><code>CMakeFiles/hmm.dir/source/main.cpp.o: In function `__static_initialization_and_destruction_0(int, int)':
/usr/include/mlpack/core/util/cli_deleter.hpp:35: undefined reference to `mlpack::util::CLIDeleter::CLIDeleter()'
/usr/include/mlpack/core/util/cli_deleter.hpp:35: undefined reference to `mlpack::util::CLIDeleter::~CLIDeleter()'
CMakeFiles/hmm.dir/source/main.cpp.o: In function `boost::program_options::error_with_option_name::~error_with_option_name()':
/usr/include/boost/program_options/errors.hpp:119: undefined reference to `vtable for boost::program_options::error_with_option_name'
CMakeFiles/hmm.dir/source/main.cpp.o: In function `boost::program_options::validation_error::validation_error(boost::program_options::validation_error::kind_t, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; const&amp;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; const&amp;, int)':
/usr/include/boost/program_options/errors.hpp:373: undefined reference to `boost::program_options::validation_error::get_template[abi:cxx11](boost::program_options::validation_error::kind_t)'

</code></pre>

<p>The <code>ldconfig -p | grep mlpack</code>  command gives this output:</p>

<pre><code>    libmlpack.so.2 (libc6,x86-64) =&gt; /usr/local/lib/libmlpack.so.2
    libmlpack.so.2 (libc6,x86-64) =&gt; /usr/lib/x86_64-linux-gnu/libmlpack.so.2
    libmlpack.so (libc6,x86-64) =&gt; /usr/local/lib/libmlpack.so
    libmlpack.so (libc6,x86-64) =&gt; /usr/lib/x86_64-linux-gnu/libmlpack.so
</code></pre>

<p>I dont know how to fix this error. Could it be because linker is getting confused with multiple libmlpack .so files? If yes, how do I fix it ? If not, what could it be?</p>

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