Use BSD tar's libarchive LZMA support if available

Avoid using an unnecessary `xz` dependency when it's not needed.

2 files changed, 11 insertions, 2 deletions

diff --git a/Library/Homebrew/extend/os/mac/dependency_collector.rb b/Library/Homebrew/extend/os/mac/dependency_collector.rb
index ee98045b6..72c619105 100644
--- a/Library/Homebrew/extend/os/mac/dependency_collector.rb
+++ b/Library/Homebrew/extend/os/mac/dependency_collector.rb
@@ -1,6 +1,11 @@
 class DependencyCollector
-  def ant_dep(spec, tags)
+  def ant_dep(tags)
     return if MacOS.version < :mavericks
-    Dependency.new(spec.to_s, tags)
+    Dependency.new("ant", tags)
+  end
+
+  def xz_dep(tags)
+    return if MacOS.version >= :lion
+    Dependency.new("xz", tags)
   end
 end
diff --git a/Library/Homebrew/extend/os/mac/development_tools.rb b/Library/Homebrew/extend/os/mac/development_tools.rb
index 381b26e66..7c97b9d69 100644
--- a/Library/Homebrew/extend/os/mac/development_tools.rb
+++ b/Library/Homebrew/extend/os/mac/development_tools.rb
@@ -76,5 +76,9 @@ class DevelopmentTools
         end
       end
     end
+
+    def tar_supports_xz?
+      false
+    end
   end
 end