Creating UTF-8 Locale for US English

I want to, need to, use UTF-8. I set LC_ALL to "en_US.UTF-8." The problem is Slackware (9.0) doesn't know anything about en_US.UTF-8 and I have to create that locale by hand like so (as root):

localedef -v -c -i en_US -f UTF-8 en_US.UTF-8

As usual, for more info see the appropriate HOWTO: Unicode HOWTO.