I have an initial implementation of the VM based build process.

The code is here: https://github.com/devrandom/gitian-builder

You will also need a build descriptor file, which is here: https://gist.github.com/803438 .  The file wxWidgets-2.9.1.tar.bz2 goes in the ./inputs directory.

This builds a 64 bit executable with an sha256sum of 53c586ca76d6548a722c11ab3e51936d2bc185d60cd7234314896aa0c1ae5d1e.  Let me know if you get anything different.  My host is Ubuntu Maverick, but this should not matter to the result.  The environment report is captured in the result directory.

Still to do:

* Generate a tar.gz file instead of just an executable.  This will require fixing the timestamps and compiling for 32 and 64 bits.
* Pin the deb package versions so that future upgrades to the target OS don't cause changes to the result.