Which Linux library contains `cmdinfo` `cmdparse` cmdparsescript` and `cmdusage`

I am trying to build a project for Raspbian with libpigpio but Im getting undefined reference errors to the following functions:

Error       undefined reference to `cmdInfo'        
Error       undefined reference to `cmdParse'       
Error       undefined reference to `cmdParseScript' 
Error       undefined reference to `cmdUsage'

What is the right library to add?