Setting fonts in widgets

[Robert Roebling <roebling ruf uni-freiburg de>]

  Good day,

is it possible, to set fonts in widgets? I saw, that there is the
GtkStyle structure, which contains an entry "font". I also
saw, that there is a function gtk_widget_set_style (or
something similar). But I don't want to change all the
style params, but only the font.
I tried to set
widget->style->font = myFont;
which resultet in a segv.
When looking at the ...set_style() code, I saw, that the
old style will get destroyed there, so it seems, that I
will have to set all style params at the same time in
order to set the font, am I right?

    Thank you and regards,

              Robert Roebling