[gentoo-user] VIM Undo Command

[Supreme]

I have a odd issue with vim. The undo last action command which is (u)
does not work in vi. The undo all changes command (Shift+u) works just
fine. Anyone ever run into this problem or know how I can fix this
issue. This problem is related to all the user on the system not just
one user. This is the error I get when I try to use the undo command:
"'u' is not implemented" . I am using version 7.2.021 of vim. I have
this same version installed on a 64 bit version of Gentoo and I am not
seeing this problem.

J.J.