https://github.com/cyrusimap/cyrus-sasl/commit/06f41c41e5c0f62ed5c1d703a9e2da42dfdb71f6
https://github.com/cyrusimap/cyrus-sasl/issues/831

From 06f41c41e5c0f62ed5c1d703a9e2da42dfdb71f6 Mon Sep 17 00:00:00 2001
From: Howard Chu
Date: Wed, 24 Jul 2024 19:27:04 +0100
Subject: [PATCH] include: only use __attribute__ on Gnu C

It's a compiler-specific feature and we can't depend on other
compilers supporting it identically or at all.
Fix #831.

Signed-off-by: Howard Chu
---
 include/prop.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/prop.h b/include/prop.h
index fed3fa77..ea38707a 100644
--- a/include/prop.h
+++ b/include/prop.h
@@ -53,6 +53,12 @@
 # define LIBSASL_VAR extern
 #endif /* WIN32 */
 
+/* Only use __attribute__ on Gnu C */
+#ifndef __GNUC__
+#undef __attribute__
+#define __attribute__(foo)
+#endif /* __GNUC__ */
+
 /* the resulting structure for property values
  */
 struct propval {