zeromq: fix MacOS references.

Needed after Homebrew/brew#16306.
Homebrew · Dec 14, 2023 · e113909 · e113909
1 parent c060d1d
commit e113909
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/Formula/z/zeromq.rb b/Formula/z/zeromq.rb
@@ -37,7 +37,7 @@ class Zeromq < Formula
 
   def install
     # Work around "error: no member named 'signbit' in the global namespace"
-    if MacOS.version == :high_sierra
+    if OS.mac? && MacOS.version == :high_sierra
       ENV.delete("HOMEBREW_SDKROOT")
       ENV.delete("SDKROOT")
     end