Don't check Subversion HTTPS pre-Sierra.

The system Subversion doesn't handle new certificate authorities (e.g.
Let's Encrypt) well enough for this check to be useful.

1 files changed, 8 insertions, 1 deletions

diff --git a/Library/Homebrew/extend/os/mac/development_tools.rb b/Library/Homebrew/extend/os/mac/development_tools.rb
index 1bb12a3d1..f54c6b8a3 100644
--- a/Library/Homebrew/extend/os/mac/development_tools.rb
+++ b/Library/Homebrew/extend/os/mac/development_tools.rb
@@ -78,8 +78,15 @@ class DevelopmentTools
     end
 
     def curl_handles_most_https_homepages?
-      # The system Curl is too old for some modern HTTPS homepages on Yosemite.
+      # The system Curl is too old for some modern HTTPS homepages on
+      # older macOS versions.
       MacOS.version >= :el_capitan
     end
+
+    def subversion_handles_most_https_certificates?
+      # The system Subversion is too old for some HTTPS certificates on
+      # older macOS versions.
+      MacOS.version >= :sierra
+    end
   end
 end