Index: subversion/bindings/swig/ruby/svn/client.rb
===================================================================
--- subversion/bindings/swig/ruby/svn/client.rb	(revision 24067)
+++ subversion/bindings/swig/ruby/svn/client.rb	(working copy)
@@ -221,10 +221,18 @@
                no_diff_deleted=false, force=false,
                header_encoding=nil)
         header_encoding ||= Core::LOCALE_CHARSET
-        Client.diff3(options, path1, rev1, path2, rev2,
-                     recurse, ignore_ancestry,
-                     no_diff_deleted, force, header_encoding,
-                     out_file, err_file, self)
+        if depth.class == TrueClass || depth.class == FalseClass
+          # DEPTH will point to a boolean recurse flag.
+          Client.diff3(options, path1, rev1, path2, rev2,
+                       depth, ignore_ancestry,
+                       no_diff_deleted, force, header_encoding,
+                       out_file, err_file, self)
+	else
+          Client.diff4(options, path1, rev1, path2, rev2,
+                       depth, ignore_ancestry,
+                       no_diff_deleted, force, header_encoding,
+                       out_file, err_file, self)
+        end
       end
 
       def diff_peg(options, path, start_rev, end_rev,