In glibc 2.3.1-8, it seems being fixed: gotom@celesta:~> sudo locale-gen Generating locales... de_DE.ISO-8859-15@euro... done gotom@celesta:~> env LC_ALL=de_DE@euro xterm gotom@celesta:~> env LC_ALL=de_DE.ISO-8859-15@euro xterm Warning: locale not supported by Xlib, locale set to C Could I close this bug? Regards, -- gotom