ERROR: character set iso8859 is not installed

[jhonny]

Bueno, lo unico que he podido encontrar al respecto es lo siguiente, en el archivo README.intl:

Empezado por Firebird

UNICODE collation
-----------------

You can use unicode collation (case sensitive and case insensitive) in all character sets present in fbintl.
They're already registerd in fbintl.conf, but you need to register in the databases you want with the attributes you desire.
They should use this name convention: charset_collation. Ex:
create collation win1252_unicode
for win1252;
create collation win1252_unicode_ci
for win1252
from win1252_unicode
case insensitive;

Note the name should be as in fbintl.conf (i.e. ISO8859_1 instead of ISO88591, for example).

Entonces algo me dice, que quizá y por alguna razón, en el archivo fbintl.conf no estaba la sección o no estaba completa la del ISO8859_1, que debe ir asi:

Empezado por Firebird

<charset ISO8859_1>
intl_module fbintl
collation ISO8859_1
collation ISO8859_1_UNICODE
collation DA_DA
collation DE_DE
collation DU_NL
collation EN_UK
collation EN_US
collation ES_ES
collation ES_ES_CI_AI
collation FI_FI
collation FR_CA
collation FR_FR
collation IS_IS
collation IT_IT
collation NO_NO
collation SV_SV
collation PT_BR
collation PT_PT
</charset>

Pero sinceramente no estoy seguro .