exmap port - shared memory profiler

I began porting this:
    http://www.berthels.co.uk/exmap/

and it is here:
    http://people.freebsd.org/~bms/dump/exmap.tgz

It needs debugging. Would anyone like to help?

It is a very useful tool for profiling memory sharing between processes.

cheers
BMS

P.S. I'm not on arch or hackers at the moment, please circulate this.