From 7277682cfbabcf2eb518339508043e96e59b5a99 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Tue, 28 Apr 2020 22:31:00 +0900
Subject: Remove unused local variable if `MRB_UTF8_STRING` is not set.

Ref #4982 #4983
---
 mrbgems/mruby-io/src/io.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mrbgems/mruby-io/src/io.c b/mrbgems/mruby-io/src/io.c
index 8d215e781..57f4025d6 100644
--- a/mrbgems/mruby-io/src/io.c
+++ b/mrbgems/mruby-io/src/io.c
@@ -1487,8 +1487,10 @@ static mrb_value
 mrb_io_readchar(mrb_state *mrb, mrb_value self)
 {
   mrb_value buf;
-  unsigned char c;
   mrb_int len = 1;
+#ifdef MRB_UTF8_STRING
+  unsigned char c;
+#endif
 
   mrb_get_args(mrb, "S", &buf);
   mrb_assert(RSTRING_PTR(buf) > 0);
-- 
cgit v1.2.3