sereral days ago, I tried it on MinGW on Windows XP
but I can't. I couldn't compile gegl. anyway here is my file.
it includes most files for compiling gimp for win.
I hope it's helpful for you.
file :
http://gimp.kr/pub/misc/compile-for-win/20080717-gimp-2.5.2.zip--
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Choi, JiHui
http://Mr-Dust.pe.krhttp://GIMP.kr,
http://OpenOffice.or.kr,
http://Ubuntu.or.kr