  
 +  if (use_ports_for_mojo_edk) {
 +    deps += [ "//local/ports/mojo_system" ]
-+    sources = [ "configuration.cc" ]
++    sources = [ "dummy.cc" ]
 +  } else {
 +    sources = [
 +      "async_waiter.cc",

   if (is_win) {
     cflags = [ "/wd4324" ]  # Structure was padded due to __declspec(align()),
                             # which is uninteresting.

 }  // namespace mojo
 
diff --git a/mojo/edk/system/BUILD.gn b/mojo/edk/system/BUILD.gn
index cd58ff4..99c1504 100644
--- a/mojo/edk/system/BUILD.gn
+++ b/mojo/edk/system/BUILD.gn
@@ -2,6 +2,7 @@
