Can't delete IPV6 addresses with ifconfig

[Tri Brotoharsono]

Daniel O'Connor wrote:
> [midget 22:27] ~ >sudo ifconfig fxp0 delete 2002:792d:8527::/64
> ifconfig: 2002:792d:8527::/64: bad value
>
> Anyone know the right way to do this?  :) 
>   
ifconfig fxp0 inet6 2002:792s:8527:: delete