error in instalation cyrus-sasl-2.1.20 in freebsd 4.9

Tue Jan 18 16:13:06 EST 2005

I am using this manual:
http://aribabiba.cosmoquimica.com.br/leandro/

During the execution of "make" it appears this eror:  
/usr/libexec/elf/ld: cannot find -lpq

that I am making bad?

Greetings  

Edgardo

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