From d29196a493b0d63ea543af2cab1db062ae39fce2 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Tue, 26 Apr 2022 10:59:50 -0400
Subject: use C2x style header versioning for include guards

---
 ctype.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

(limited to 'ctype.h')

diff --git a/ctype.h b/ctype.h
index 97e4351..6d5cf77 100644
--- a/ctype.h
+++ b/ctype.h
@@ -1,5 +1,9 @@
-#ifndef __CTYPE_H__
-#define __CTYPE_H__
+#ifndef __STDC_VERSION_CTYPE_H__
+#if defined __STDC_VERSION__
+#define __STDC_VERSION_CTYPE_H__ __STDC_VERSION__
+#else
+#define __STDC_VERSION_CTYPE_H__ 1
+#endif
 
 /*
 UNG's Not GNU
@@ -43,7 +47,7 @@ int isxdigit(int);
 int tolower(int);
 int toupper(int);
 
-#if (defined __STDC_VERSION__ && 199901L <= __STDC_VERSION__)
+#if (199901L <= __STDC_VERSION_CTYPE_H__)
 int isblank(int);
 #endif
 
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