title: Eigen and MKL 11.2
body: <p>I'm trying to link Eigen to MKL 11.2
  I have the latest stable release of Eigen 3.2.4. However even so <a href="http://eigen.tuxfamily.org/bz/show_bug.cgi?id=874" rel="nofollow">this bug</a> was still present, which I fixed with the latest source from the Eigen repository. </p>
  
  <p>Now when I try to compile using the given flags from <a href="https://software.intel.com/en-us/articles/intel-mkl-link-line-advisor/" rel="nofollow">here</a>, more specifically:</p>
  
  <pre><code>-O3 -std=c++11 -m64 -I/opt/intel/mkl/include
  </code></pre>
  
  <p>I still get the following error:</p>
  
  <pre><code>main.cpp:(.text._ZmlIN5Eigen6MatrixIdLin1ELin1ELi0ELin1ELin1EEEER6ADNodeIT_ES6_
  S6_[_ZmlIN5Eigen6MatrixIdLin1ELin1ELi0ELin1ELin1EEEER6ADNodeIT_ES6_S6_]+0x3f4)
  : undefined reference to `dgemm'
  </code></pre>
  
  <p>I'm not an expert on C++ linking and etc, can anyone advise me what more should I add to the compiler flags?</p>