cannot create locale UTF-8

# mkdir /usr/share/locale/en_US.UTF-8
# localedef -v -ci en_US -f UTF-8 /usr/share/locale/en_US.UTF-8
/usr/share/i18n/locales/en_US:7: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:8: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:9: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:11: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:14: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:15: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:16: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:17: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:19: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:20: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:21: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:22: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:23: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:24: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:25: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:26: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:27: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:28: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:29: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:34: non-symbolic character value should not be used
/usr/share/i18n/locales/en_GB:50: non-symbolic character value should not be used
/usr/share/i18n/locales/i18n:1107: non-symbolic character value should not be used
/usr/share/i18n/locales/i18n:1313: non-symbolic character value should not be used
/usr/share/i18n/locales/i18n:1345: non-symbolic character value should not be used
/usr/share/i18n/locales/i18n:1373: non-symbolic character value should not be used
/usr/share/i18n/locales/en_GB:53: non-symbolic character value should not be used
/usr/share/i18n/locales/en_GB:59: non-symbolic character value should not be used
/usr/share/i18n/locales/en_US:40: non-symbolic character value should not be used
/usr/share/i18n/locales/translit_neutral:10: non-symbolic character value should not be used
/usr/share/i18n/locales/translit_neutral:11: non-symbolic character value should not be used
/usr/share/i18n/locales/translit_neutral:12: non-symbolic character value should not be used
/usr/share/i18n/locales/translit_neutral:13: non-symbolic character value should not be used
/usr/share/i18n/locales/translit_neutral:14: non-symbolic character value should not be used
/usr/share/i18n/locales/translit_neutral:15: non-symbolic character value should not be used
/usr/share/i18n/locales/translit_neutral:16: non-symbolic character value should not be used
/usr/share/i18n/locales/translit_neutral:17: non-symbolic character value should not be used
LC_NAME: field `name_gen' not defined
LC_IDENTIFICATION: field `audience' not defined
LC_IDENTIFICATION: field `application' not defined
LC_IDENTIFICATION: field `abbreviation' not defined
LC_IDENTIFICATION: no identification for category `LC_MEASUREMENT'
LC_CTYPE: table for class "upper": 1564 bytes
LC_CTYPE: table for class "lower": 1564 bytes
LC_CTYPE: table for class "alpha": 3616 bytes
LC_CTYPE: table for class "digit": 600 bytes
LC_CTYPE: table for class "xdigit": 600 bytes
LC_CTYPE: table for class "space": 792 bytes
LC_CTYPE: table for class "print": 5144 bytes
LC_CTYPE: table for class "graph": 5144 bytes
LC_CTYPE: table for class "blank": 792 bytes
LC_CTYPE: table for class "cntrl": 664 bytes
LC_CTYPE: table for class "punct": 4120 bytes
LC_CTYPE: table for class "alnum": 3616 bytes
LC_CTYPE: table for class "combining": 2076 bytes
LC_CTYPE: table for class "combining_level3": 2076 bytes
LC_CTYPE: table for map "toupper": 14364 bytes
LC_CTYPE: table for map "tolower": 12828 bytes
LC_CTYPE: table for map "totitle": 14364 bytes
LC_CTYPE: table for width: 22744 bytes
# _