title: Wrong module version on compile
body: <p>I wanted to compile my Fortran programs (.f90) with mpif90, but I get the following:</p>
  
  <pre><code>use a_box
     1
  Fatal Error: Wrong module version '6' (expected '9') for 
                         file 'a_box.mod' opened at (1)
  </code></pre>
  
  <p>Can you help me to solve this problem? Thanks!</p>
  
  <p>The mpif90 version is as follows:</p>
  
  <pre><code>GNU Fortran (Ubuntu/Linaro 4.7.2-2ubuntu1) 4.7.2
  </code></pre>
  
  <p>My system is Ubuntu 12.10.</p>