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In a clean unpack of bogofilter-1.2.0.tar.bz2, running ./configure in the top directory fails to create a Makefile.
Tested on Debian 4.0 amd64, Ubuntu 8.04.2 (Hardy) i386 and FreeBSD 7.1 amd64
Captured session showing configure output
You don't have a Makefile because configure failed!
Take a look at the last few lines of configure's output and correct the problem reported there.