title: OPEN MPI is not working for me
body: <p>I have installed MPI and GCC seperatly using yum commands,
  And now when I use following command:</p>
  
  <pre><code>mpic++ first.c -o first
  </code></pre>
  
  <p>it says:</p>
  
  <pre><code>bash: mpic++: command not found
  </code></pre>
  
  <p><strong>Can somebody please help me? I will be very thankful.</strong></p>
  
  <p><em>Background: I am using centos 6.5, and i am new on linux, however I have good understanding of terminal.</em></p>