message: Potential fix for the qsim build on VirtualBox
  Fixing:
diff: #pragma one
  #include "xacc.hpp"
  #include "AllGateVisitor.hpp"
  +
  +// Workaround VirtualBox bug: https://www.virtualbox.org/ticket/15471
  +// VirtualBox enables AVX2 flag but not FMA flag in -march=native
  +// which is a **bug**, there is no such config.
  +// qsim lib's simmux relies on AVX2 flag for simulator selection,
  +// hence we just disable AVX support if compiling on VirtualBox.
  +#ifdef __AVX2__
  +#ifndef __FMA__
  +#undef __AVX2__
  +#endif
  +#endif
  +
  // Qsim:
  #include "circuit.h"
  #include "gates_qsim.h"
  