--- /dev/null
+#
+# OELAYOUT_ABI allows us to notify users when the format of TMPDIR changes in
+# an incompatible way. Such changes should usually be detailed in the commit
+# that breaks the format and have been previously discussed on the mailing list
+# with general agreement from the core team.
+#
+OELAYOUT_ABI = "2"
+
+#
+# DISTRO_PR allows us to regenerate all packages when a fundamental change is
+# made which requires such a global change. This is appended to the recipe
+# specific PR values when set. A default value is given here but a distro can
+# override this value.
+#
+DISTRO_PR ?= ""