Due to the bug in bison 2.1, I always use version 1.875: http://www.mail-archive.com/bug-bison@gnu.org/msg00718.html
""Christopher Kings-Lynne"" <chris.kingslynne@gmail.com>
> What version of Bison is currently required to compile HEAD? 1.75
> doesn't seem to work...
>
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> TIP 5: don't forget to increase your free space map settings
>
