Hi, I've put together a short description on how to build both, a 64- and a 32-bit version of OpenJDK 8 on a plain, vanilla WindowsXP 64-bit operating system using only free (as in free beer) tools:
http://weblogs.java.net/blog/simonis/archive/2011/10/28/yaojowbi-yet-another-openjdk-windows-build-instruction It seems as if it is not that hard anymore nowadays:) Regards, Volker