building PHP on OS X with pgsql support

I tried both the fink package (installed the package postgresql-shlibs
as well), which is based on 7.2.3, and compiled 7.3rc1 myself. With the
fink package, it won't find libpq-fe.h (it ain't there, as far as I can
make out, i.e. I ran a find on the entire fink tree). With 7.3rc1, I get
an error upon running

./configure --with-pgsql=/usr/local/pgsql:

+--------------------------------------------------------------------+
| *** ATTENTION *** |
| |
| Something is likely to be messed up here, because the configure |
| script was not able to detect a simple feature on your platform. |
| This is often caused by incorrect configuration parameters. Please |
| see the file debug.log for error messages. |
| |
| If you are unable to fix this, send the file debug.log to the |
| php-install(at)lists(dot)php(dot)net mailing list and include appropiate |
| information about your setup. |
+--------------------------------------------------------------------+

The debug.log file looks like this:

-------------------- begin debug.log --------------------
bash-2.05a# cat debug.log
CONFIGURE: './configure' '--with-pgsql=/usr/local/pgsql'
CC: gcc
CFLAGS: -g -O2
CPPFLAGS: -traditional-cpp
CXX:
CXXFLAGS:
INCLUDES: -I$(top_builddir)/Zend -I/usr/src/php-4.2.3/ext/mysql/libmysql -I/usr/local/pgsql/include
LDFLAGS: -L/usr/local/pgsql/lib -L/usr/local/pgsql/lib
LIBS: -lpq -lm
DLIBS:
SAPI: cgi
PHP_RPATHS: /usr/local/pgsql/lib
uname -a: Darwin titan.archi-me-des.de 6.2 Darwin Kernel Version 6.2: Tue Nov 5 22:00:03 PST 2002; root:xnu/xnu-344.12.2.obj~1/RELEASE_PPC Power Macintosh powerpc

gcc -o conftest -g -O2 -traditional-cpp -L/usr/local/pgsql/lib -L/usr/local/pgsql/lib conftest.c -lpq -lm 1>&5
-------------------- end debug.log --------------------

Any ideas?

Regards, Frank