I'm not sure if this is only error in the documentation,
but I decided to file it under Network Related anyway.

According to the manual,

"Streams are an integral part of PHP  as of version 4.3.0. No steps are required to enable them."

When I try a simple

<?php

 $f = stream_get_wrappers();
 echo '<pre>';
 print_r($f);
 echo '</pre>';

?>

all I get is 

Fatal error:  Call to undefined function: stream_get_wrappers()

./configure --help doesn't mention streams anywhere,
nor does phpinfo() mention anything about it either
(apart from "Registered PHP Streams").

According to the linker, main/streams.lo is linked. 

I haven't been able to find anything on the web about it either, nor did the good people on EFNet's #php channel know anything about it.

My configure line is 

'./configure' 
'--with-mysql=/usr/local/mysql/' 
'--with-gd' 
'--with-ldap' 
'--with-sockets' 
'--with-xml' 
'--with-dom' 
'--with-freetype' 
'--with-apxs2=/usr/local/apache2/bin/apxs' 
'--with-zlib' 
'--with-bz2' 
'--with-ssl' 
'--with-tsrm-pth' 
'--with-cli' 
'--disable-cgi' 
'--with-pdflib' 
'--with-pgsql' 
'--with-wddx' 
'--with-curl' 
'--with-curlwrappers'