Various applications like quodlibet won't start:

$ quodlibet

(quodlibet:2095): Gtk-WARNING **: Locale not supported by C library.
Using the fallback 'C' locale.
Traceback (most recent call last):
File "/usr/bin/quodlibet", line 315, in ?
load_library()
File "/usr/bin/quodlibet", line 251, in load_library
library.init(const.LIBRARY)
File "/usr/share/quodlibet/library.py", line 290, in init
print to(_("Supported formats: %s")) % s
File "/usr/share/quodlibet/util.py", line 168, in to
enc = locale.getpreferredencoding()
File "/usr/lib/python2.4/locale.py", line 417, in getpreferredencoding
setlocale(LC_CTYPE, "")
File "/usr/lib/python2.4/locale.py", line 381, in setlocale
return _setlocale(category, locale)
locale.Error: unsupported locale setting

ehm it is glibc related, you will need to generate you locales. It reduces glibc with 50mb in size.

[root@just4fun cimi]# locale
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=it_IT@euro
LC_CTYPE="it_IT@euro"
LC_NUMERIC="it_IT@euro"
LC_TIME="it_IT@euro"
LC_COLLATE=C
LC_MONETARY="it_IT@euro"
LC_MESSAGES="it_IT@euro"
LC_PAPER="it_IT@euro"
LC_NAME="it_IT@euro"
LC_ADDRESS="it_IT@euro"
LC_TELEPHONE="it_IT@euro"
LC_MEASUREMENT="it_IT@euro"
LC_IDENTIFICATION="it_IT@euro"
LC_ALL=
[root@just4fun cimi]# locale-gen
Generating locales...
Generation complete.




Nothing useful...

Did you read the frontpage news about it? No locale is generated at all, so you didn't put the right stuff in /etc/locale.gen.

Resolved!!! Sorry but I haven't seen the news! Now seen!