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https://bugzilla.redhat.com/show_bug.cgi?id=460304
--- Comment #21 from Bryan O'Sullivan bos@serpentine.com 2008-09-05 11:59:45 EDT --- Re comment #15:
The makefile step is not necessary for correctness, but it makes a big difference to build performance: it lets us build most of a package in parallel using _smp_mflags. Cabal itself won't have the ability to do parallel builds for a long, long time.