diff --git a/.gitmodules b/.gitmodules
index b3d9ad9..41d063b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -289,3 +289,7 @@ url = ../rpm/lua-macros.git
 [submodule "lua54"]
 path = lua54
 url = ../rpm/lua54.git
+
+[submodule "m4"]
+path = m4
+url = ../rpm/m4.git
diff --git a/m4 b/m4
new file mode 160000
index 0000000..78fdc4b
--- /dev/null
+++ b/m4
@@ -0,0 +1 @@
+Subproject commit 78fdc4be7bb670765e4b255a11437316c459babc