testlibpq.c compilation

Hi,

I been having what seems to be a usual error in compiling the
testlibpq.c source from the postgres website.

<SNIP>
/tmp/ccQ79123.o: In function `exit_nicely':
/tmp/ccQ79123.o(.text+0xe): undefined reference to `PQfinish'
/tmp/ccQ79123.o: In function `main':
/tmp/ccQ79123.o(.text+0x6d): undefined reference to `PQsetdbLogin'
/tmp/ccQ79123.o(.text+0x81): undefined reference to `PQstatus'
/tmp/ccQ79123.o(.text+0xb3): undefined reference to `PQerrorMessage'
</SNIP>

etc etc.

All the responses I've seen to it seem to suggest that it is a
problem with the path to libpq-fe.h. However I am sure this is not the
problem which I am experiencing.

Any advice on this would be much appreciated. If it helps this is
compiled on a FreeBSD4.2 machine, and postgres was compiled with no
special options at all.

Thanks

Lee