Description:
------------
I have configured and installed PHP successfully, everything works except when I try and create a Informix DB Connection:


Reproduce code:
---------------
<?php
  $conn = ifx_connect("db@host", "username", "password");
?>

I get the following error:

Warning: ifx_connect() [function.ifx-connect]: E [SQLSTATE=IX 001 SQLCODE=-1829] in /www/htdocs/test.php on line 2

PHP was configured with: 

./configure 
--with-mysql=/usr/local/mysql 
--with-informix=/opt/informix 
--with-apxs2=/www/bin/apxs 
--with-gd 
--with-zlib-dir=/usr/local 
--with-jpeg-dir=/usr/local 
--enable-ftp 
--with-mssql=/usr/local 
--enable-track-vars 
--with-freetype 
--with-pdflib=/usr/local/pdflib

Both $INFORMIXDIR and $INFORMIXSERVER have been set.

Expected result:
----------------
Create the DB connection.

Any help or advice would be appreciated.