How to build android-x86 on 32bit PC (1)

I borrowed  'CZC P10T' Atom tablet from one of my friend.
P10T is base model of TegaV2 and Viewpad10.
I try to install Gingerbread in it.

After Gingerbread, we can't build android on 32bit PC and 32bit OS.
My build PC is very poor.

• PC: ASUS EeePC T91MT
• CPU: Intel Atom Z520 1.33GHz (32bit, Single core, fake HT)
• RAM: 2GB
• Dist: Ubuntu 10.10

but I have only this one.
Oh! I can't build Gingerbread...

Almost app may build 32bit.
Why Google change it?
I don't understand.