--- Gnu-Mach/util/putchar.c	2020/09/02 04:36:59	1.1.1.1
+++ Gnu-Mach/util/putchar.c	2020/09/02 04:47:10	1.1.1.2
@@ -21,8 +21,11 @@
  *      Author: Bryan Ford, University of Utah CSL
  */
 
+#include <device/cons.h>
+
 int putchar(int c)
 {
 	cnputc(c);
+	return c;
 }