Character set 'gbk' is not a compiled character set and is not specified in the '/usr/local/share/mysql/charsets/Index.xml' file

[jeff jeff]

my operate system is freebsd 6.0
i configure my mysql-5.0.22 with
./configure --prefix=/usr/local/mysql --with-charset=latin1 --with-extra-charsets=armscii8,ascii,big5,cp1250,cp1251,cp1256,cp1257,cp850,cp852,cp866,cp932,dec8,eucjpms,euckr,gb2312,gbk,geostd8,greek,hebrew,hp8,keybcs2,koi8r,koi8u,latin1,latin2,latin5,latin7,macce,macroman,sjis,swe7,tis620,ucs2,ujis,utf8

then when we finish my install ,i user the command
"mysqldump -uroot -p --default-character-set=gbk --skip-opt --databases ktkj --tables cdb_members > cdb_members.sql"
to dump my mydatabase .
but cause the error
"mysqldump: Character set 'gbk' is not a compiled character set and is not specified in the '/usr/local/share/mysql/charsets/Index.xml' file "

when i change the default-character-set=gbk to default-character-set=latin1 ,it work well..

who can tell how to resolve the problem .think you everyone;