diff --git a/build/nio4r/2.7.1 b/build/nio4r/2.7.1
new file mode 100644
index 0000000..d72115a
--- /dev/null
+++ b/build/nio4r/2.7.1
@@ -0,0 +1 @@
+EXTRA_PKGS="linux-headers"
diff --git a/build/rack/3.0.10 b/build/rack/3.0.10
new file mode 100644
index 0000000..e69de29