Merge pull request #1451 from jnozsc/macOS_11.0_Big_Sur

compatible with macOS 11

Author: hsbt

bin/ruby-build

@@ -91,7 +91,7 @@ os_information() {
  if type -p lsb_release >/dev/null; then
  lsb_release -sir | xargs echo
  elif type -p sw_vers >/dev/null; then
- echo "OS X $(sw_vers -productVersion)"
+ echo "$(sw_vers -productName) $(sw_vers -productVersion)"
  elif [ -r /etc/os-release ]; then
  source /etc/os-release
  echo "$NAME" $VERSION_ID