RCov Gem Installation problem

I couldn't get RCov installed this week:

$ sudo gem install rcov --trace
ERROR:  While executing gem ... (OptionParser::InvalidOption)
    invalid option: --trace

Poking around a wee bit, I discovered that this was just rubyforge being obnoxious.  Go download the tarball form of the file and then just "sudo gem install [name of the tarball]".  All good.