diff --git a/Library/Homebrew/api.rb b/Library/Homebrew/api.rb
index 9b60a85b3c..36ee1a2308 100644
--- a/Library/Homebrew/api.rb
+++ b/Library/Homebrew/api.rb
@@ -159,9 +159,11 @@ module Homebrew
 
     sig { params(json: Hash).returns(Hash) }
     def self.merge_variations(json)
-      if (bottle_tag = ::Utils::Bottles.tag.to_s.presence) &&
-         (variations = json["variations"].presence) &&
-         (variation = variations[bottle_tag].presence)
+      bottle_tag = ::Utils::Bottles::Tag.new(system: Homebrew::SimulateSystem.current_os,
+                                             arch:   Homebrew::SimulateSystem.current_arch)
+
+      if (variations = json["variations"].presence) &&
+         (variation = variations[bottle_tag.to_s].presence)
         json = json.merge(variation)
       end
 
diff --git a/Library/Homebrew/dev-cmd/unbottled.rb b/Library/Homebrew/dev-cmd/unbottled.rb
index 5c866198a6..118e68cd0f 100644
--- a/Library/Homebrew/dev-cmd/unbottled.rb
+++ b/Library/Homebrew/dev-cmd/unbottled.rb
@@ -4,6 +4,7 @@
 require "cli/parser"
 require "formula"
 require "api"
+require "os/mac/xcode"
 
 module Homebrew
   extend T::Sig
diff --git a/Library/Homebrew/requirements/macos_requirement.rb b/Library/Homebrew/requirements/macos_requirement.rb
index 0cff48ac90..addba7473d 100644
--- a/Library/Homebrew/requirements/macos_requirement.rb
+++ b/Library/Homebrew/requirements/macos_requirement.rb
@@ -51,12 +51,12 @@ class MacOSRequirement < Requirement
   end
 
   def version_specified?
-    OS.mac? && @version
+    @version.present?
   end
 
   satisfy(build_env: false) do
     T.bind(self, MacOSRequirement)
-    next Array(@version).any? { |v| MacOS.version.public_send(@comparator, v) } if version_specified?
+    next Array(@version).any? { |v| MacOS.version.public_send(@comparator, v) } if OS.mac? && version_specified?
     next true if OS.mac?
     next true if @version
 
@@ -68,7 +68,7 @@ class MacOSRequirement < Requirement
 
     case @comparator
     when ">="
-      "macOS #{@version.pretty_name} or newer is required for this software."
+      "This software does not run on macOS versions older than #{@version.pretty_name}."
     when "<="
       case type
       when :formula
@@ -82,10 +82,10 @@ class MacOSRequirement < Requirement
     else
       if @version.respond_to?(:to_ary)
         *versions, last = @version.map(&:pretty_name)
-        return "macOS #{versions.join(", ")} or #{last} is required for this software."
+        return "This software does not run on macOS versions other than #{versions.join(", ")} and #{last}."
       end
 
-      "macOS #{@version.pretty_name} is required for this software."
+      "This software does not run on macOS versions other than #{@version.pretty_name}."
     end
   end
 
@@ -107,9 +107,9 @@ class MacOSRequirement < Requirement
   def display_s
     if version_specified?
       if @version.respond_to?(:to_ary)
-        "macOS #{@comparator} #{version.join(" / ")}"
+        "macOS #{@comparator} #{version.join(" / ")} (or Linux)"
       else
-        "macOS #{@comparator} #{@version}"
+        "macOS #{@comparator} #{@version} (or Linux)"
       end
     else
       "macOS"
diff --git a/Library/Homebrew/requirements/xcode_requirement.rb b/Library/Homebrew/requirements/xcode_requirement.rb
index 80de0ef42b..c75bea041e 100644
--- a/Library/Homebrew/requirements/xcode_requirement.rb
+++ b/Library/Homebrew/requirements/xcode_requirement.rb
@@ -58,9 +58,9 @@ class XcodeRequirement < Requirement
   end
 
   def display_s
-    return name.capitalize unless @version
+    return "#{name.capitalize} (on macOS)" unless @version
 
-    "#{name.capitalize} >= #{@version}"
+    "#{name.capitalize} >= #{@version} (on macOS)"
   end
 end