diff --git a/metadata/layout.conf b/metadata/layout.conf
new file mode 100644
index 0000000..e957371
--- /dev/null
+++ b/metadata/layout.conf
@@ -0,0 +1,3 @@
+# We want eclasses from the gentoo repo. This happens by default with portage,
+# but pkgcore complains if we don't spell it out explicitly.
+masters = gentoo