title: How to add macro Visual Studio 2019
body: <p>I was trying to make a program to sniff packets and went to libtins</p>
  
  <blockquote>
    <p>If you are using a static build of libtins on Windows, then you have link your application with tins.lib. You also need to add this macro definition to your project: 
    TINS_STATIC</p>
  </blockquote>
  
  <p>What does it mean? It even does not have a value. Can some one help me how to add this in visual studio?</p>
  
  <p>Does it mean something like</p>
  
  <pre><code>#define TINS_STATIC
  </code></pre>