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Prefix changed in debian, include "gnu" in the commandline.
Signed-off-by: Carlos O'Donell <carlos@parisc-linux.org>

Ensure the compiler version is new enough (>= 3.3)
Signed-off-by: Randolph Chung <tausq@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>