# Uninstall old gems
gem list '\A(?:(?:d[mo])[_-]|data_?(?:mapper|objects))' \
  | egrep '\b0\.10\.0\b' \
  | cut -d" " -f1 \
  | xargs sudo gem uninstall -v0.10.0 -Ix
 
sudo gem uninstall extlib -v0.9.13 -Ix
 
# Verify all 0.10.0 versions are uninstalled
gem list '\A(?:(?:d[mo])[_-]|data_?(?:mapper|objects)|extlib)'
 
# Install everything
sudo gem install do_postgres do_mysql do_sqlite3 dm-core dm-more
 
# Verify all versions are installed
gem list '\A(?:(?:d[mo])[_-]|data_?(?:mapper|objects)|extlib)'