title: Driver Manager ODBC error when attempting to write to Vertica
body: <p>I'm attempting to write to a Vertica database using SQLAlchemy. </p>
  
  <p>I've created my engine as follows:</p>
  
  <pre><code>from sqlalchemy import create_engine
  import sclalchemy_vertica
  engine = create_engine('vertica+pyodbc://username:password@127.0.0.1:9223/DB')
  df.to_sql('some_table', engine)
  </code></pre>
  
  <p>where df is a pandas dataframe with some data. However, upon attempting to write, I get the following error:</p>
  
  <pre><code>DBAPIError: (pyodbc.Error) ('01000', "[01000] [unixODBC][Driver Manager]Can't open lib 'Vertica' : file not found (0) (SQLDriverConnect)")
  </code></pre>
  
  <p>anyone know what this might be about? I am on Mac OS X. </p>