--- a/src/java.desktop/unix/native/libawt_xawt/awt/awt_Robot.c	Fri Mar 02 19:10:12 2018 +0100
+++ b/src/java.desktop/unix/native/libawt_xawt/awt/awt_Robot.c	Sat Mar 03 08:21:47 2018 +0100
@@ -93,7 +93,7 @@
     }
 }
 
-static int32_t isXTestAvailable() {
+static int32_t isXTestAvailable(void) {
     int32_t major_opcode, first_event, first_error;
     int32_t  event_basep, error_basep, majorp, minorp;
     int32_t isXTestAvailable;