For the record, I've found the following "kitchen sink options" will
build and install on OS X 10.5 with macports.
sudo -i
port install gmake
port install gawk
port install flex
port install bison +yacc
port install openldap
port install openssl
port install libxml
port install libxml2
port install libxmldiff
port install libxmlxx
port install libxmlxx2
port install python25
port install perl5.8 +darwin_9 +threads +shared
port install tcl +threads
## Some of these ports may replace a currently installed port.
## Use 'port deactivate XXX' on the currently installed port XXX.
## Then run the install again to enable the new port.
## Use 'port variants XXX' to identify install candidates.
mkdir -p /usr/src
cd /usr/src
curl -O ftp://ftp5.us.postgresql.org/pub/PostgreSQL/source/v8.3.3/postgresql-8.3.3.tar.gz
tar zxvf postgresql*.tar.gz
cd postgresql-8.3.3
./configure \
--with-includes=/opt/local/include \
--with-libraries=/opt/local/lib \
--with-perl --with-python --with-tcl \
--with-krb5 --with-gssapi --with-pam \
--with-ldap --with-openssl --enable-thread-safety \
--with-bonjour --with-libxml --with-libxslt \
--with-system-tzdata=/usr/share/zoneinfo
## Check config.log to confirm where it found libraries
gmake
# Wait for "All of PostgreSQL successfully made. Ready to install."
gmake install
# Wait for "PostgreSQL installation complete."