title: NVM in nodejs returns "no shasum" error
body: <p>I installed NVM on my system and tried to install a newer version of nodejs by the following commands:</p>
  
  <pre><code>nvm install v0.8.23
  </code></pre>
  
  <p>and</p>
  
  <pre><code>nvm install 0.8.23
  </code></pre>
  
  <p>But I get the following error:</p>
  
  <pre><code>/usr/bin/which: no shasum in ($PATH)
  ######################################################################## 100.0%
  Checksums do not match.
  Binary download failed, trying source.
  Additional options while compiling: 
  nvm: install N/A failed!
  </code></pre>
  
  <p>and then nothing happens. How can I fix this problem?!</p>
  
  <p>Update-1_<strong><em>_</em>__<em>_</em>__<em>_</em>__<em>_</em>__<em>_</em>__<em>_</em>__<em>_</em>__<em>_</em>__<em>_</em>__<em>_</em>__<em>_</em>__<em>_</em>__<em>_</em>____</strong></p>
  
  <p>I tried changing the permission and creating an alias but they didn't effect anything.
  I made a symlink shasum -> sha1sum and the output changed (but still I'm not having ):</p>
  
  <pre><code>######################################################################## 100.0%
  Checksums do not match.
  Binary download failed, trying source.
  Additional options while compiling: 
  nvm: install N/A failed!
  </code></pre>