--- lib/dummypthread.h        2021-06-09 16:06:23.000000000 +0200
+++ lib/dummypthread.h        2021-12-30 11:56:21.898242877 +0100
@@ -4,7 +4,7 @@
 #define pthread_create(A, B, C, D)
 #define pthread_join(A, B)
 #define pthread_cancel(A)
-#define pthread_testcancel()
+#define pthread_testcancel(void)
 
 #define pthread_mutex_init(A, B)
 #define pthread_mutex_destroy(A)