[Fontconfig] How to add dir in fonts.conf

[Paul Sprencz]

Hi,

I am a new in a usage of fontconfig. 
I use GNOME2.2 stack and I want to install my bdf font file. 
I have same problem to install this font permamently . Now I used xset fp+.
I found the font.conf file which have a section <dir> in it could be define a 
directory path where the server search for fonts.
My question is:
Could help me anybody how I can add in this file a new directory <dir> ... 
</dir> using a command line, not edit manually. I want that at make install 
the path where the font file installed to be added in fonts.conf file.

Thank you very much.

Best Regards
Paul Sprencz