diff --git a/.chromiumos-build b/.chromiumos-build
new file mode 100644
index 0000000000..41a8258801
--- /dev/null
+++ b/.chromiumos-build
@@ -0,0 +1,5 @@
+[Options]
+# ../third_party/xscreensaver is a bit of a wart here, necessitated by odd
+# directory layout.
+builddirs: ../build/%(architecture)s/local_packages .. ../platform ../third_party ../third_party/xscreensaver
+destdir: ../build/%(architecture)s/local_packages