diff --git a/Library/Homebrew/os/mac.rb b/Library/Homebrew/os/mac.rb
index 6f496b849f..1466a8fd1b 100644
--- a/Library/Homebrew/os/mac.rb
+++ b/Library/Homebrew/os/mac.rb
@@ -214,6 +214,7 @@ module OS
       "6.3"   => { :clang => "6.1", :clang_build => 602 },
       "6.3.1" => { :clang => "6.1", :clang_build => 602 },
       "6.3.2" => { :clang => "6.1", :clang_build => 602 },
+      "7.0"   => { :clang => "7.0", :clang_build => 700 },
     }
 
     def compilers_standard?
diff --git a/Library/Homebrew/os/mac/version.rb b/Library/Homebrew/os/mac/version.rb
index 06901b6427..febbfd4f75 100644
--- a/Library/Homebrew/os/mac/version.rb
+++ b/Library/Homebrew/os/mac/version.rb
@@ -4,6 +4,7 @@ module OS
   module Mac
     class Version < ::Version
       SYMBOLS = {
+        :el_capitan    => '10.11',
         :yosemite      => '10.10',
         :mavericks     => '10.9',
         :mountain_lion => '10.8',
diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 26382dea33..1ae0a57d68 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -18,7 +18,7 @@ module OS
         else
           # Default to newest known version of Xcode for unreleased OSX versions.
           if MacOS.version > "10.10"
-            "6.3.2"
+            "7.0"
           else
             raise "Mac OS X '#{MacOS.version}' is invalid"
           end
@@ -161,6 +161,7 @@ module OS
 
       def latest_version
         case MacOS.version
+        when "10.11" then "700.0.53"
         when "10.10" then "602.0.53"
         when "10.9"  then "600.0.57"
         when "10.8"  then "503.0.40"