I compile Php 4.0.3pl1 like this:

./configure --with-apache=/apache_1.3.12 --with-oracle=/u01/app/oracle/product/8.1.6 --with-oci8=u01/app/oracle/product/8.1.6  --with-ldap --without-mysql
make
make install

ldap.php:

<? 
$ds=ldap_connect("localhost");
if ($ds) {
echo "1";
}
else
{
echo "0";
}

With this config, the scipt return 0;

When i compile without oracle and oci8, the scipt return 1.

I don't try another extension, such as imap.