Configure script unable to find PgSQL dir

I'm attempting to compile and install this from source but I'm getting a "library not found" error:

# ls -l /export/appl/pkgs/pgsql
total 4
lrwxrwxrwx 1 root other 6 May 23 09:29 latest -> v9.1.3
drwxr-xr-x 6 root other 512 May 8 16:02 v9.1.3

./configure \
--prefix=/export/appl/pkgs/psqlodbc/v09.01.0100 \
--with-libpq=/export/appl/pkgs/pgsql/latest \
--with-unixodbc=/export/appl/pkgs/unixodbc/latest \
--enable-unicode \
--host=sparc-sun-solaris2.10 \
--disable-openssl
...
checking for PQconnectdb in -lpq... no
configure: error: libpq library not found

I also configured using --without-libpq and the package was made and installed correctly, but I don't think it knows how to connect:

# ./isql pidcim11 odbcuser xxx
[ISQL]ERROR: Could not SQLConnect

If this is not the right address to ask questions is there a forum that I can post my problem to?

thx,

- Joe

If you type "Google" into Google, you can break the Internet. -- Jen Barber