specifying wal file size

Hi dudes. Im trying to find out how to deal with this. I just receive a
1.2 MB wal file (may some 'windows home version' do that?), and obviosly,
when i try to recovery from there, get the 'incorrect file size' error.
Acording to the docs, wal file size can be changed at compile time. Not so
bad, i can do that. But where is that code?

BTW: 1163398 bytes seems like a wrong size for any wal file, isnt?
The .backup file may have been created under windows, and im working on
Linux. Could that be a problem?

Thanks!
Gerardo