diff -Naur gtkdialog-0.8.4pre-svn514ORIG/src/automaton.c gtkdialog-0.8.4pre-svn514/src/automaton.c
--- gtkdialog-0.8.4pre-svn514ORIG/src/automaton.c	2015-09-24 17:14:21.000000000 +0800
+++ gtkdialog-0.8.4pre-svn514/src/automaton.c	2018-07-25 16:13:24.655999441 +0800
@@ -1299,8 +1299,13 @@
 /* 120701 BK Puppy Linux forum member jamesbond fixed this for arm cpus...*/
 stackelement _sum(stackelement b, stackelement a)
 #else
+/* 180727 BK and jamesbond: this is required to detect 64-bit arm...*/
+#ifdef __aarch64__
+stackelement _sum(stackelement b, stackelement a)
+#else
 stackelement _sum(stackelement a, stackelement b)
 #endif
+#endif
 {
 	int n;
 	/* Let's copy the widgets from b to a */