Hassan Schroeder <hassan(dot)schroeder(at)gmail(dot)com> writes:
> However, retrieving it from several different mirrors gives me the
> same checksum, which doesn't match the file retrieved from this
> <http://www.postgresql.org/ftp/source/v8.4.1/postgresql-8.4.1.tar.gz>
> location.
There is no such location... if you look closer you'll see what you
have is a 404 Not Found response, which Safari has helpfully wrapped
up into a .gz file :-(
regards, tom lane