diff --git a/init.el b/init.el
index 3272236..793e226 100644
--- a/init.el
+++ b/init.el
@@ -1,5 +1,5 @@
 ;;; init.el --- tastytea's Emacs init file.
-;; Time-stamp: <2019-09-30T06:00:30+00:00>
+;; Time-stamp: <2019-09-30T10:00:39+00:00>
 
 ;;; Commentary:
 ;; Requires at least Emacs 24.3.
@@ -443,6 +443,11 @@ With argument, do this that many times."
    "tastytea-legacy"                    ; For old code.
    '("bsd"
      (c-basic-offset . 4)))
+
+  (defun my/get-builddir ()
+    (if (member 'projectile-mode minor-mode-list)
+        (concat (projectile-project-root) "build")
+      nil))
   :custom
   (c-default-style "tastytea"))