diff --git a/.dir-locals.el b/.dir-locals.el
new file mode 100644
index 0000000000..dbf5ed0eda
--- /dev/null
+++ b/.dir-locals.el
@@ -0,0 +1,4 @@
+((prog-mode . ((indent-tabs-mode . nil)
+               (tab-width . 4)
+               (c-basic-offset . 4)))
+ (c-mode . ((mode . C++))))