Viewpoint manager missing

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Hello,
I installed Fricas on Debian from source.
Fricas works fine in a terminal window
But if I do:
draw( sin ( tan (  x ) - tan ( sin ( x ) ) , x = 0..6)

I get "Graph data being transmitted to the viewport manager..." and it
hangs!

What can I do? No idea what a viewport manager is. Where to get it?
With friendly greetings,
Peter

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<div dir=3D"auto">Hello,<div dir=3D"auto">I installed Fricas on Debian from=
 source.</div><div dir=3D"auto">Fricas works fine in a terminal window</div=
><div dir=3D"auto">But if I do:</div><div dir=3D"auto">draw( sin ( tan (=C2=
=A0 x ) - tan ( sin ( x ) ) , x =3D 0..6)</div><div dir=3D"auto"><br></div>=
<div dir=3D"auto">I get &quot;Graph data being transmitted to the viewport =
manager...&quot; and it hangs!</div><div dir=3D"auto"><br></div><div dir=3D=
"auto">What can I do? No idea what a viewport manager is. Where to get it?=
=C2=A0</div><div dir=3D"auto">With friendly greetings,</div><div dir=3D"aut=
o">Peter</div></div>

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