diff -U3 -r a/mgetty.h b/mgetty.h
--- a/mgetty.h	2006-01-01 12:13:18.000000000 -0500
+++ b/mgetty.h	2018-01-13 12:53:00.337516215 -0500
@@ -198,7 +198,7 @@
  */
 #if defined(__alpha__) || defined(__sparc64__) || \
 	    defined(__ia64__) || defined(__s390x__) || defined(__x86_64__) || \
-	    defined(__powerpc64__)
+	    defined(__powerpc64__) || defined(__aarch64__)
 # define PTR_IS_LONG
 #endif