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

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

(limited to 'fenv.h')

diff --git a/fenv.h b/fenv.h
index f7b78f6..d5af9fe 100644
--- a/fenv.h
+++ b/fenv.h
@@ -1,5 +1,9 @@
-#ifndef __FENV_H__
-#define __FENV_H__
+#ifndef __STDC_VERSION_FENV_H__
+#if defined __STDC_VERSION__
+#define __STDC_VERSION_FENV_H__ __STDC_VERSION__
+#else
+#define __STDC_VERSION_FENV_H__ 1
+#endif
 
 /*
 UNG's Not GNU
@@ -27,7 +31,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#if !(defined __STDC_VERSION__ && 199901 <= __STDC_VERSION__)
+#if (__STDC_VERSION_FENV_H__ < 199901L)
 # error "<fenv.h> requires C99 or higher"
 #endif
 
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