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-rw-r--r--Library/Homebrew/requirements/xcode_requirement.rb7
1 files changed, 6 insertions, 1 deletions
diff --git a/Library/Homebrew/requirements/xcode_requirement.rb b/Library/Homebrew/requirements/xcode_requirement.rb
index a5f078c62..9396b0df7 100644
--- a/Library/Homebrew/requirements/xcode_requirement.rb
+++ b/Library/Homebrew/requirements/xcode_requirement.rb
@@ -22,7 +22,12 @@ class XcodeRequirement < Requirement
A full installation of Xcode.app#{version} is required to compile this software.
Installing just the Command Line Tools is not sufficient.
EOS
- if MacOS.version >= :lion
+ if Version.new(MacOS::Xcode.latest_version) < Version.new(@version)
+ message + <<~EOS
+ Xcode#{version} cannot be installed on macOS #{MacOS.version}.
+ You must upgrade your version of macOS.
+ EOS
+ elsif MacOS.version >= :lion
message + <<~EOS
Xcode can be installed from the App Store.
EOS