diff -r 0015bf3a82e0 -r 489867818774 src/java.desktop/unix/native/libawt/awt/awt_LoadLibrary.c
--- a/src/java.desktop/unix/native/libawt/awt/awt_LoadLibrary.c	Fri Mar 02 19:10:12 2018 +0100
+++ b/src/java.desktop/unix/native/libawt/awt/awt_LoadLibrary.c	Sat Mar 03 08:21:47 2018 +0100
@@ -51,7 +51,7 @@
    first loaded */
 JavaVM *jvm;
 
-JNIEXPORT jboolean JNICALL AWTIsHeadless() {
+JNIEXPORT jboolean JNICALL AWTIsHeadless(void) {
     static JNIEnv *env = NULL;
     static jboolean isHeadless;
     jmethodID headlessFn;