windows build problem with cygwin / libxml / iconv

I had problems trying to build PHP with cygwin.  Here's what I've done so far. 
I downloaded PHP 5.0.2 source, the bindlib_w32 source, and the win32build source 
to my /work directory and opened up my cygwin shell.  First I tried:

cd /work/php-5.0.2
./configure

This fails horribly when it gets to the extensions section.  Specifically it 
failed when testing for libxml.  There were a *lot* of error messages in my 
config.log (so I won't post it here) so I just tried to build without extensions 
next.

./configure --disable-all
make
make install
make test

This mostly worked.  Configure finished and cached some of my config info. 
Cygwin created the makefile and I think it was able to build the CGI version of 
PHP, but since I had no PCRE extension I couldn't test the build.  So we try again:

./configure --disable-libxml

This failed.  It asked me to run configure --with-iconv, but I wasn't sure what 
prefix to use?  So instead I tried:

./configure --disable-libxml --without-iconv
make
make install
make test

Success!  I have a CGI build of PHP in /usr/local/bin even though it did fail 
several tests.  However, I have no XML support and I have no PEAR (requires XML 
support to install).  So my questions to you all are:

- How do I enable libxml?
- What prefix / directory should I be using with --with-iconv ?  Heck, what is 
iconv even supposed to be?