[vtkusers] How to run CPack on a VTK build

[John Biddiscombe]

You initially staed windows and XP, but

> CPack Error: Problem running tar command: "/usr/local/bin/cmake" -E 
> tar cfz control.tar.gz ./control ./md5sums

Looks like a linux build. Have you got the dos unix tools installed in 
/usr/local/bin/cmake on your windows box? if not, then fix the tar 
program in cmake. If you have, then I can't help you. as I don't know 
what's wrong.

JB