[Gimp-docs] there are some error using cygwin for compiling gimp manual

[In your heart..]

Hi all
I use the cygwin in Windows XP Pro SP2 for compiling gimp manual.
in past days, I compiled in Ubuntu in VMware.

you know VMware is very slow, and because my computer isn't good, that
was too hard
Thus I thanked Jan Smith who comtributed cygwin guide for gimp-compile.

But, there are some problems.
This is the error message.

I/O error : Attempt to load network entity
http://www.oasis-open-org/docbook/xml/4.3/../src/bibliography/bibliogrphy.xml:4:
warning: failed to load external entity
"http://www.docbook.org/xml/4.3/docbookx.dtd"
'http://www.docbook.org/xml/4.5/docbookx.dtd'>


Of couse I installed docbook 4.3 as following the guide.
and my office connect in Internet always.

What's the matter? what do I need? some package missing?

BTW in interesting, there is the message
"Validating XML for ko   number of errors : 0"


please, help me.
should I do something, or ignore these errors?