ahodesuka

diff --git a/gtk/gtkfilechooserdefault.c b/gtk/gtkfilechooserdefault.c
index 2a75365..b466ab2 100644
--- a/gtk/gtkfilechooserdefault.c
+++ b/gtk/gtkfilechooserdefault.c
@@ -81,6 +81,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <locale.h>
+#include <math.h>