--- tests/gdkgears.c	2024-01-24 09:14:34.000000000 +0800
+++ tests/gdkgears.c	2024-03-25 04:47:55.000000000 +0800
@@ -1,4 +1,5 @@
 #include <stdlib.h>
+#include <math.h>
 #include <gtk/gtk.h>
 
 #include "gtkgears.h"