problems with r.param.scale

Dear GRASS-users,

I have a problem running r.parm.scale. Every time I try to run this
module an error occurs after counting to 100%.

segmentation fault

My DGM I use is o.k. I run other modules (like r.sun...) on the
testdata.

My system is a Pentium 200 with linux and grass4.2.1 V18 (linux
binaries from Markus - Thanks a lot!)

Another question:
r.in.tiff don't work on my computer: Error message: can't load libary
'libjpeg.so.6'
Where I can get this libaries and where I have to put them?

And my last question: is there a script availiable for importing
arc/info tiff-files (like the export-script r.out.arctiff)

Many thanks in advanced for any suggestion.