--- a/main.c
+++ b/main.c
@@ -28,6 +28,8 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
 
 // use the first one of these that exists
 static char *default_device[] = {"/dev/midi00", "/dev/midi", NULL};