patchdir=$rvm_path/patches/ruby/1.9.3/p0
mkdir -p $patchdir
curl https://raw.github.com/gist/1658360/cumulative_performance.patch > $patchdir/falcon.patch
rvm install 1.9.3 -n perf --patch $patchdir/falcon.patch
rvm use 1.9.3-perf