class.c: include gc.h to suppress 'implicit declaration of function' on some environments.

1 files changed, 1 insertions, 0 deletions

diff --git a/class.c b/class.c
index 6a4d3fb264..682a21d488 100644
--- a/class.c
+++ b/class.c
@@ -26,6 +26,7 @@
 #include "ruby/internal/config.h"
 #include <ctype.h>
 
+#include "gc.h"
 #include "constant.h"
 #include "id_table.h"
 #include "internal.h"