diff --git a/.gitmodules b/.gitmodules
index 75ba4db6b6..a3f3b52cfd 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -547,3 +547,6 @@
 	path = libs/mp11
 	url = ../mp11.git
 	fetchRecurseSubmodules = on-demand
+[submodule "callable_traits"]
+	path = libs/callable_traits
+	url = ../callable_traits.git
diff --git a/libs/callable_traits b/libs/callable_traits
new file mode 160000
index 0000000000..684dfbd7df
--- /dev/null
+++ b/libs/callable_traits
@@ -0,0 +1 @@
+Subproject commit 684dfbd7dfbdd0438ef3670be10002ca33a71715