From a64f72c6c388ad64518c41d56811cb5cb65aa7a7 Mon Sep 17 00:00:00 2001
From: Julien Schueller <schueller@phimeca.com>
Date: Fri, 25 Oct 2024 18:35:35 +0200
Subject: [PATCH] util: Fix copysign redefinition

---
 src/util/nlopt-util.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/util/nlopt-util.h b/src/util/nlopt-util.h
index e9c49f95..40963b7f 100644
--- a/src/util/nlopt-util.h
+++ b/src/util/nlopt-util.h
@@ -37,11 +37,13 @@
 #endif
 
 #ifndef HAVE_COPYSIGN
+#if !defined(__cplusplus) && __STDC_VERSION__ < 199901
    /* not quite right for y == -0, but good enough for us */
 #  define copysign(x, y) ((y) < 0 ? -fabs(x) : fabs(x))
-#elif !defined(__cplusplus) && __STDC_VERSION__ < 199901
+#else
 extern double copysign(double x, double y); /* may not be declared in C89 */
 #endif
+#endif
 
 #ifdef __cplusplus
 extern "C" {