title: Need C library that implements set operations
body: <p>I'm looking for a C library (not C++) that implements set operations. I need to support the following operations:</p>
  
  <ul>
  <li>intersection</li>
  <li>union</li>
  <li>elementOf</li>
  <li>isSubset</li>
  <li>insert (add to set)</li>
  <li>clone</li>
  <li>equals</li>
  </ul>
  
  <p>Could I just use the libc binary tree routines?</p>