./configure --program-transform-name="s/grub/grub2/"
And the installed files (in this case for i386-pc) will be:
/usr/lib/grub2/i386-pc/*
/usr/local/sbin/grub2-emu
/usr/local/sbin/grub2-install
...etc
Also grub2-install place boot files in "/boot/grub2"
This allows easy integration into distributions as it allows grub2 to
sit side by side with a grub legacy install without.