I helped Mesa port their 32-bit driver to 64-bit.  It works fine (just 
some type changes really).  The current version in svn should have a 
rosdep that installs the right version when you run 'rosdep install 
sr4k' (assuming you haven't installed it already).

Dejan Pangercic wrote:
> Hi Patrick,
> On Wed, Mar 31, 2010 at 5:57 PM, Patrick Beeson <beeson.p@gmail.com> wrote:
>> I have added a new sr4k package to the camera_drivers_experimental
>> stack.  This extends the swissranger package in the tum repository to
>> handle the newer Mesa Imaging libraries, and supports both SR3000 and
>> SR4000 devices.
> great job and thx for doing this.
> According to http://www.mesa-imaging.ch/drivers.php, the libmesasr
> driver for 64 bit architectures is still in the beta stage.
> Did you test while developing in 32 or 64 bit environment?
> cheers, D.
>