--- zzzz-none-000/linux-2.6.39.4/include/linux/if.h	2011-08-03 19:43:28.000000000 +0000
+++ puma6-arm-6490-729/linux-2.6.39.4/include/linux/if.h	2021-11-10 13:23:10.000000000 +0000
@@ -23,7 +23,15 @@
 #include <linux/socket.h>		/* for "struct sockaddr" et al	*/
 #include <linux/compiler.h>		/* for "__user" et al           */
 
+/* nsc@avm: gently define IFNAMSIZ is not yet done; check for consistency */
+#ifdef IFNAMSIZ
+# if IFNAMSIZ != 16
+#  error IFNAMSIZ has been defined != 16
+# endif
+#else
 #define	IFNAMSIZ	16
+#endif
+
 #define	IFALIASZ	256
 #include <linux/hdlc/ioctl.h>