diff --git a/_constraints b/_constraints
new file mode 100644
index 0000000000000000000000000000000000000000..e8415de8e64dc275e327b1e3e5a276690e567f97
--- /dev/null
+++ b/_constraints
@@ -0,0 +1,6 @@
+<constraints>
+  <linux><version>
+    <min>4.0</min>
+  </version></linux>
+</constraints>
+