mercurial port won't build

[Brian Dunn]

$ sudo port install mercurial +bash_completion
--->  Building mercurial
Error: Target org.macports.build returned: shell command " cd "/opt/ 
local/var/macports/build/ 
_opt_local_var_macports_sources_rsync 
.macports.org_release_ports_devel_mercurial/work/mercurial-1.2.1" && / 
opt/local/bin/python2.5 setup.py --no-user-cfg build " returned error 1
Command output: usage: setup.py [global_opts] cmd1 [cmd1_opts] [cmd2  
[cmd2_opts] ...]
    or: setup.py --help [cmd1 cmd2 ...]
    or: setup.py --help-commands
    or: setup.py cmd --help

error: option --no-user-cfg not recognized

Error: Status 1 encountered during processing.

any clues?