You can clone with
(Imported from Trac #59, reported by @syntaxpolice on 2006-01-24)
(Imported comment by @dcoutts on 2006-01-24)
cabal-install-0.4.0 uses user install by default. One has to specify --global to get a global install. The downside is that root also has to specify this to get a global install.
(Imported comment by @dcoutts on 2007-10-26)
Closing. If people want global installs by default when running as root then open another bug.