[Wien] can't see my graph in Wien2k_12

[mouhamed mahdi]

Dear Wien2K Users,


I have wien2k_12 installed on  Ubuntu 12.04, the program compilation was ok.
we installed gnuplot
when we want to see the graph DOS for example, we can't see them.
starting gnuplot give this massage:
 gnuplot

    G N U P L O T
    Version 4.6 patchlevel 1    last modified 2012-09-26
    Build System: Linux i686

    Copyright (C) 1986-1993, 1998, 2004, 2007-2012
    Thomas Williams, Colin Kelley and many others

    gnuplot home:     http://www.gnuplot.info
    faq, bugs, etc:   type "help FAQ"
    immediate help:   type "help"  (plot window: hit 'h')

Terminal type set to 'unknown'

i can't set terminal to X11 or pdf
plot dose not work and it give no think in output
can any help PLZ
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