From 9fabe8eea326282c58a4fd3884e0999bb1d49f8b Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 30 Jan 2017 04:54:52 +0000
Subject: fix up r57461

* internal.h: Microsoft Visual C++ has never supported C99 yet,
  even in 2017.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57462 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 internal.h | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/internal.h b/internal.h
index f57b6f9c81..fada2e8023 100644
--- a/internal.h
+++ b/internal.h
@@ -29,10 +29,13 @@ extern "C" {
 
 #ifndef __bool_true_false_are_defined
 # ifndef __cplusplus
-#  error :FIXME: You are the first one who use pre-C99 compiler.
-#  error :FIXME: Please add appropriate definition here.
-#  error :FIXME: This part is intentionally left undefined,
-#  error :FIXME: because the author no longer have such environment.
+#  undef bool
+#  undef false
+#  undef true
+#  define bool signed char
+#  define false 0
+#  define true 1
+#  define __bool_true_false_are_defined 1
 # endif
 #endif
 
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