ruby-install rbx 2.2.6, Rubinius Mavericks "error: ... rl_username_completion_function" workaround

ruby-install-rbx-2.2.6-rl_username_completion_function-fix

# If installing Rubinius 2.2.6 fails
# with an error containing 'rl_username_completion_function'
ruby-install rbx 2.2.6 # <= fails

# Remove and re-extract Rubinius
cd ~/src && rm -fr rubinius-2.2.6 && tar -xf rubinius-2.2.6.tar.bz2

# Make sure LLVM is installed
brew install llvm
# Make sure the other libs are present
brew install openssl readline libyaml gdbm

# Re-configure Rubinius
cd ~/src/rubinius-2.2.6
export GEM_HOME="$HOME/src/rubinius-2.2.6/vendor/gems"
bundle install
./configure --prefix="/Users/pete/.rubies/rbx-2.2.6" \
            --with-opt-dir="/usr/local/opt/openssl:/usr/local/opt/readline:/usr/local/opt/libyaml:/usr/local/opt/gdbm" \
            --skip-system --skip-prebuilt --llvm-path="/usr/local/opt/llvm"

# Build
rake build
# then install
rake install
# optionally install all Rubinius files
rake install:files

Same issue when looking at the log file after running rvm install 2.7.2