first commit

kivy_venv/share/kivy-examples/includes/button.kv

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+#:kivy 1.8.0
+
+<SpecialButton>:
+    canvas:
+        Color:
+            rgba: 1.0, 0.0, 0.0, 1.0
+        Rectangle:
+            pos: self.pos
+            size: (self.size[0]/4, self.size[1]/4)

kivy_venv/share/kivy-examples/includes/layout.kv

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+#:kivy 1.8.1
+#:include button.kv
+
+<CustomLayout>:
+    SpecialButton:
+        text: 'Includes!'

kivy_venv/share/kivy-examples/includes/main.py

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+from kivy.app import App
+from kivy.uix.boxlayout import BoxLayout
+from kivy.uix.button import Button
+
+
+class SpecialButton(Button):
+    pass
+
+
+class CustomLayout(BoxLayout):
+    pass
+
+
+class TestApp(App):
+    pass
+
+
+if __name__ == '__main__':
+    TestApp().run()

kivy_venv/share/kivy-examples/includes/test.kv

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+#:kivy 1.8.1
+#:include layout.kv
+#:include force button.kv
+
+CustomLayout: