These symbols are necessary for (at least some) apps, but are initialized by constructors which are currently not supported for apps. Therefore we include these symbols into the Contiki kernel to make them thus available to the apps indirectly via the contiki-labels mechanism.
diff --git a/contiki-apple2/lib/import.S b/contiki-apple2/lib/import.S
new file mode 100644
index 0000000..d7be51f
--- /dev/null
+++ b/contiki-apple2/lib/import.S
@@ -0,0 +1,10 @@
+;
+; Forced importing code for Contiki (Apple2 version)
+;
+; These symbols are necessary for (at least some) apps, but are
+; initialized by constructors which are currently not supported
+; for apps. Therefore we include these symbols into the Contiki
+; kernel to make them thus available to the apps indirectly via
+; the contiki-labels mechanism.
+
+ .forceimport __dos_type