diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c7c484845661b8d61259f71230391460c1b7e480
--- /dev/null
+++ b/external/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(range-v3)