How to find out about zlib compression

Dear all,

It says in the postgresql 8 documentation :

"If PostgreSQL was built on a system with the zlib compression library installed, the custom dump format will compress data as it writes it to the output file"

My question, if we are using binaries on a rpm based system and without looking at the src.rpm is there a way to query the postgresql server to find out whether it was built against the zlib compression library ?

Thank you in advance

Low Kian Seong