How to change to 64-bit.

[Kevin O'Gorman]

I seem to be running in 32-bit mode on my laptop, but it's actually 64-bit
capable and dual-boots to Vista 64-bit.  It's
confirmed by /proc/cpuinfo with gives a virtual address space of 48 bits
(physical 36).

I wonder what I have to do to switch.  I am unable to do simple things like
compile with -m64 because gcc complains
about some stub library that I cannot find.

What am I missing?  A repository?  A package?  This is a first time for me,
so I'm completely clueless, and the
only advice I can see is about installing fresh, which I'd really rather not
do.

-- 
Kevin O'Gorman, PhD
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