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+## Machine objects get `kernel` and `userland` properties
+
+Meson has traditionally provided a `system` property to detect the
+system being run on. However this is not enough to reliably
+differentiate between e.g. an iOS platform from a watchOS one. Two new
+properties, namely `kernel` and `userland` have been added to make
+this configuration doable.
+
+These new properties are not necessary in cross files for now, but if
+they are not defined and a build file tries to access them, Meson will
+exit with a hard error. It is expected that at some point in the
+future defining the new properties will become mandatory.