diff --git a/.gitmodules b/.gitmodules
index e69de29..9162369 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "3rdparty/indirect_predicates"]
+	path = 3rdparty/indirect_predicates
+	url = https://github.com/WangZhiCheng2001/Indirect_Predicates.git
diff --git a/3rdparty/indirect_predicates b/3rdparty/indirect_predicates
new file mode 160000
index 0000000..ca74afb
--- /dev/null
+++ b/3rdparty/indirect_predicates
@@ -0,0 +1 @@
+Subproject commit ca74afb8c664ed24b4482fb3c8a3175102ce3dcb