font , charset ...?

Bonjour,

Je n'ai jamais rien compris =E0 la
gestion des fonts sous linux
(ni ailleur d'ailleur)

J'ai vu qu'il y a des packages
(apt-cache search font) pour la
console, pour X.

J'imagine que chaque application gere
=E0 sa fa=E7on les polices. Emacs n'a pas
les memes font que Mozilla Mail par exemple.

Et quand je lance gnucash j'obtiens:

The font "-*-helvetica-medium-r-normal--12-*-*-*-*-*-iso8859-1,
-*-arial-medium-r-normal--12-*-*-*-*-*-iso8859-1,
-*-helvetica-medium-r-normal--12-*-*-*-*-*-iso8859-15,=

=20
-*-arial-medium-r-normal--12-*-*-*-*-*-iso8859-15,*-r-*" does not=20
support all the required character sets for the current locale "fr_FR@eur=
o"
(Missing character set "ISO8859-15")
(Missing character set "ISO8859-15")
The font "-adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*" does not=20
support all the required character sets for the current locale "fr_FR@eur=
o"
(Missing character set "ISO8859-15")
(Missing character set "ISO8859-15")
Warning: gnucash_style_set_register...(): Cannot load font:=20
-adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*

The font "-adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*" does not=20
support all the required character sets for the current locale "fr_FR@eur=
o"
(Missing character set "ISO8859-15")
(Missing character set "ISO8859-15")
Fatal Error: gnucash_style_set_register...(): Cannot load fallback font: =

-adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*

The font "-adobe-helvetica-medium-o-normal--*-120-*-*-*-*-*-*" does not=20
support all the required character sets for the current locale "fr_FR@eur=
o"

[...]

C'est le character set?

Merci