For a system whose main purpose is to run PRECIS, it is recommended to use a a standard 32 bit Linux install, although PRECIS is able to run on 64 bit Linux (as modern 64 bit processors can run 32 bit executables natively).
Mozilla Firefox or Konqueror
pdksh (public domain Korn Shell, included with the PRECIS software package)
gnuplot (for plotting with the PRECIS analysis tool ppdata)
gv (GhostView, for viewing *.ps postscript files)
a PDF file viewer such as Acrobat Reader, evince or okular
a text editor program like Emacs or Pico is helpful
Set up a 'precis' user account during the installation