diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..7c2a5e77
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "tool/support/node-o3-xml"]
+	path = tool/support/node-o3-xml
+	url = git://github.com/ajaxorg/node-o3-xml.git
+[submodule "tool/support/async"]
+	path = tool/support/async
+	url = git://github.com/fjakobs/async.js.git
diff --git a/tool/support/async b/tool/support/async
new file mode 160000
index 00000000..1ca039ca
--- /dev/null
+++ b/tool/support/async
@@ -0,0 +1 @@
+Subproject commit 1ca039caaf8fef048a0bf11835ca48cf56984bcb
diff --git a/tool/support/node-o3-xml b/tool/support/node-o3-xml
new file mode 160000
index 00000000..14181cd1
--- /dev/null
+++ b/tool/support/node-o3-xml
@@ -0,0 +1 @@
+Subproject commit 14181cd1fc52378a79dd230b7086b3e60d6e1003