$ cat Foo-new.patch
diff -Npurd Foo-old/one.txt Foo-new/one.txt
--- Foo-old/one.txt	2012-08-16 08:21:35.609375000 -0700
+++ Foo-new/one.txt	2012-08-16 08:19:45.859375000 -0700
@@ -1 +1 @@
-hi there
+hello there
diff -Npurd Foo-old/two.txt Foo-new/two.txt
--- Foo-old/two.txt	1969-12-31 16:00:00.000000000 -0800
+++ Foo-new/two.txt	2012-08-16 08:19:25.500000000 -0700
@@ -0,0 +1 @@
+new file