xcrvfit installation notes
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For command line usage of xcrvfit for both mac or linux, try re-naming the
xcrvfit directory as /usr/local/xcrvfit or /usr/local/packages/xcrvfit.

Then make a link to the executable in /usr/local/bin
    (eg ln -s /usr/local/xcrvfit/xcrvfit /usr/local/bin/xcrvfit)

The advantage of using the command line is that errors and warnings are 
displayed in your terminal window, and many people are simply more comfortable
to cd to their xcrvfit directory and typing xcrvfit.

*****

The levmar curvefitting software recommends using the lapack and blas
linear algebra libraries. However the default configuration in xcrvfit is to not use
them unless indicated in the application defaults file. Perhaps I will find examples
that will change my viewpoint on this, but if i can avoid a dependency without cost,
then I will. 

*****

Right now plplot, which does the 3d plots, is dependent on tcl8.4 for linux and
tcl8.5 for macosx. It just seems like my (old) linux machines have 8.4 and macs have 
8.5 so maybe that is the majority of people. This tool has limited use so if you
are stuck, let me know. 

*****

The 32 bit linux version should work on 64 bit linux machines but not the other
way around.