How to change LDAP schema by programming?

[Worawut Suphasanthitikul <g42wsp@cp.eng.chula.ac.th>]

  I saw some code for changing the schema in "Implementing LDAP" book, 
such as add new ObjectClass or add new Attribute. He wrote with Java and
use for Netscape Directory. How can I find any example for Openldap with
C?

Thanks..
Worawut