Add platform/external/ply
diff --git a/default.xml b/default.xml
index d19be3a..df60920 100644
--- a/default.xml
+++ b/default.xml
@@ -534,6 +534,7 @@
   <project name="platform/external/pcre" />
   <project name="platform/external/ping" />
   <project name="platform/external/ping6" />
+  <project name="platform/external/ply" />
   <project name="platform/external/ppp" />
   <project name="platform/external/proguard" />
   <project name="platform/external/protobuf" />