diff --git a/vendor/pugixml b/vendor/pugixml
new file mode 160000
index 0000000000..41b6ff21c4
--- /dev/null
+++ b/vendor/pugixml
@@ -0,0 +1 @@
+Subproject commit 41b6ff21c455865bb8ef67c5952b7f895b62bacc
diff --git a/vendor/xtensor b/vendor/xtensor
new file mode 160000
index 0000000000..ef091807f7
--- /dev/null
+++ b/vendor/xtensor
@@ -0,0 +1 @@
+Subproject commit ef091807f7ed0e5ba7e251a6c46f4af7bba79e2e
diff --git a/vendor/xtl b/vendor/xtl
new file mode 160000
index 0000000000..f5d13e6c4f
--- /dev/null
+++ b/vendor/xtl
@@ -0,0 +1 @@
+Subproject commit f5d13e6c4f856becc178939365fcdcf9a657ffb5