title: How to change compiler of OpenMPI
body: <p>I have OpenMPI which is using gcc to compile. I need to cross compile from an x86_64 host architecture to an aarch64 target architecture. Instead of using gcc to compile, I want to use aarch64-linux-gnu-gcc to cross compile.</p>
  
  <p>Anyone know how to change the compiler from gcc to aarch64-linux-gnu-gcc?</p>
  
  <p>Thanks in advance.</p>