diff --git a/BUILD b/BUILD
index d73ff92..ad16e74 100644
--- a/BUILD
+++ b/BUILD
@@ -13,3 +13,17 @@
         "//os:srcs",
     ],
 )
+
+# For use in Incompatible Target Skipping:
+# https://docs.bazel.build/versions/master/platforms.html#skipping-incompatible-targets
+#
+# Specifically this lets targets declare incompatibility with some set of
+# platforms. See
+# https://docs.bazel.build/versions/master/platforms.html#more-expressive-constraints
+# for some more details.
+constraint_setting(name = "incompatible_setting")
+
+constraint_value(
+    name = "incompatible",
+    constraint_setting = ":incompatible_setting",
+)