From c74b6e71ce93c24d412c64b6b666bf5aa9b1de8d Mon Sep 17 00:00:00 2001
From: Brad Smith <brad@comstyle.com>
Date: Sun, 22 Mar 2026 01:26:44 -0400
Subject: [PATCH] Add detection for function pthread_threadid_np for macOS

Fix #443
---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure.ac b/configure.ac
index 9b5e7ee..b209c17 100644
--- a/configure.ac
+++ b/configure.ac
@@ -242,6 +242,9 @@ fi
 AC_SUBST(LIBS_PRIVATE)
 AM_CONDITIONAL([HAVE_PTHREAD_SPIN_LOCKS], [test x$ac_cv_lib_pthread_pthread_spin_lock = xyes])
 
+# check for pthread_threadid_np
+AC_CHECK_FUNCS(pthread_threadid_np)
+
 AC_CACHE_CHECK([whether libcunit is available],
                [ac_cv_have_cunit],
                [ac_save_CFLAGS="$CFLAGS"