Need C library that implements set operations

I'm looking for a C library (not C++) that implements set operations. I need to support the following operations:

• intersection
• union
• elementOf
• isSubset
• insert (add to set开发者_如何学运维)
• clone
• equals

Could I just use the libc binary tree routines?

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I haven't used it myself, but pblSet looks solid.