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-rw-r--r--internal.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 6e4cd271a0..37488bec8c 100644
--- a/internal.h
+++ b/internal.h
@@ -729,6 +729,9 @@ struct RBasicRaw {
} while (0)
/* parse.y */
+#ifndef USE_SYMBOL_GC
+#define USE_SYMBOL_GC 1
+#endif
VALUE rb_parser_get_yydebug(VALUE);
VALUE rb_parser_set_yydebug(VALUE, VALUE);
int rb_is_const_name(VALUE name);