font ligature problem

[Marc Hohl]

Hello list,

how can I switch off the font ligature mechanism for
\markups?

I have \markup { \wordwrap { ... Aufführung ... } }

and lilypond replaces the consecutive f's with a "ff" ligature,
which I want to avoid, because ligatures are not used in this case
(in German texts, it is).

I tried
\concat { Auf führung }
and even
\concat { Auf "" führung }
but to no avail.

I use the font "Goudy bookletter 1911 Italic" here, but I think
this is not a font-specific problem.

Any ideas?

Thanks in advance,

Marc