3 files changed, 40 insertions, 20 deletions
diff --git a/Library/Homebrew/requirements/linux_requirement.rb b/Library/Homebrew/requirements/linux_requirement.rb
new file mode 100644
index 000000000..cb4666e56
--- /dev/null
+++ b/Library/Homebrew/requirements/linux_requirement.rb
@@ -0,0 +1,9 @@
+class LinuxRequirement < Requirement
+  fatal true
+
+  satisfy(build_env: false) { OS.linux? }
+
+  def message
+    "Linux is required."
+  end
+end
diff --git a/Library/Homebrew/requirements/macos_requirement.rb b/Library/Homebrew/requirements/macos_requirement.rb
new file mode 100644
index 000000000..c89144d2c
--- /dev/null
+++ b/Library/Homebrew/requirements/macos_requirement.rb
@@ -0,0 +1,31 @@
+require "requirement"
+
+class MacOSRequirement < Requirement
+  fatal true
+
+  def initialize(tags = [])
+    @version = MacOS::Version.from_symbol(tags.first) unless tags.empty?
+    super
+  end
+
+  def minimum_version_specified?
+    OS.mac? && @version
+  end
+
+  satisfy(build_env: false) do
+    next MacOS.version >= @version if minimum_version_specified?
+    next true if OS.mac?
+    next true if @version
+    false
+  end
+
+  def message
+    return "macOS is required." unless minimum_version_specified?
+    "macOS #{@version.pretty_name} or newer is required."
+  end
+
+  def display_s
+    return "macOS is required" unless minimum_version_specified?
+    "macOS >= #{@version}"
+  end
+end
diff --git a/Library/Homebrew/requirements/minimum_macos_requirement.rb b/Library/Homebrew/requirements/minimum_macos_requirement.rb
deleted file mode 100644
index 2cb63f740..000000000
--- a/Library/Homebrew/requirements/minimum_macos_requirement.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-require "requirement"
-
-class MinimumMacOSRequirement < Requirement
-  fatal true
-
-  def initialize(tags)
-    @version = MacOS::Version.from_symbol(tags.first)
-    super
-  end
-
-  satisfy(build_env: false) { MacOS.version >= @version }
-
-  def message
-    "macOS #{@version.pretty_name} or newer is required."
-  end
-
-  def display_s
-    "macOS >= #{@version}"
-  end
-end