Gtk::Label and proportional font

[Isenmann Daniel <daniel isenmann t-online de>]

Hi,

how can I set a proportional font in a Gtk::Label?

Is this possible?

I will write a text and i need a proportional font, because of the
spaces between the characters. When I use the normal font, there will be
more space for _ than - (example).

So, how can I use proportional font. It must be proportional, if the
user change the font in his config, the font in my app must be the same
as I set it.

Can anyone help me??

Thanks, Daniel