--- a/1.0.0.rc16/tools/dmevent_tool.c.old	2024-12-26 18:39:04.294039876 -0700
+++ a/1.0.0.rc16/tools/dmevent_tool.c	2024-12-26 18:45:59.416784807 -0700
@@ -123,7 +123,7 @@
 }
 
 /* Increment option counters. */
-static _process_opt(int opt, const char *cmd)
+static int _process_opt(int opt, const char *cmd)
 {
 	struct opt_def_struct {
 		const char opt;		/* Option character. */
@@ -148,7 +148,7 @@
 
 			optc[o->type]++;
 			optc[OPT_SUM]++;
-			return;
+			return 0;
 		}
 	}