<p>In <a href="https://github.com/mlpack/mlpack/pull/535#discussion_r54936836">src/mlpack/CMakeLists.txt</a>:</p>
<pre style='color:#555'>&gt; @@ -41,11 +41,11 @@ if(UNIX AND NOT APPLE)
&gt;      target_link_libraries(mlpack rt)
&gt;  endif(UNIX AND NOT APPLE)
&gt;  
&gt; -# Log::Assert may require linking against whatever provides backtrace
&gt; -# functionality.
&gt; -if(Backtrace_FOUND)
&gt; -  target_link_libraries(mlpack ${Backtrace_LIBRARIES})
&gt; -endif(Backtrace_FOUND)
&gt; +# Backtrace for Ubuntu need those libs.
</pre>
<p>I'd change Ubuntu to just "Linux" here.</p>

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