Problems with libpq

I am currently having problems with libpq. In my program I am trying to connect
to the postgre database and get data from it by SELECT. 

In the begining of my program, I have a line  #include "/usr/include/pgsql/libpq-fe.h"
which should get the libpq to work, however, whenever I use libpq function,
I get error msg like /tmp/ccCyqMcP.o(.text+0x66): undefined reference to `PQsetdbLogin'

/tmp/ccCyqMcP.o(.text+0x77): undefined reference to `PQstatus'
/tmp/ccCyqMcP.o(.text+0xa1): undefined reference to `PQerrorMessage'
/tmp/ccCyqMcP.o(.text+0xcf): undefined reference to `PQclear'
/tmp/ccCyqMcP.o(.text+0xe0): undefined reference to `PQexec'                 

Can anyone please tell me why I am having this problem?

Jason Lam
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