From ad9b42a23c8428dca08227fa95abeae4d4bce911 Mon Sep 17 00:00:00 2001
From: Eisuke Kawashima <e-kwsm@users.noreply.github.com>
Date: Sat, 18 Oct 2025 02:53:53 +0900
Subject: [PATCH] build: check availability of <sys/queue.h>

musl does not provide the header.
<https://wiki.musl-libc.org/faq#Q:-Why-is-%3Ccode%3Esys/queue.h%3C/code%3E-not-included?>
---
 configure.ac | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure.ac b/configure.ac
index 623b8fe5..b8edb220 100644
--- a/configure.ac
+++ b/configure.ac
@@ -85,6 +85,7 @@ AC_CHECK_HEADERS([stdlib.h])
 AC_CHECK_HEADERS([stdtime/tzfile.h])
 AC_CHECK_HEADERS([string.h])
 AC_CHECK_HEADERS([sys/param.h])
+AC_CHECK_HEADERS([sys/queue.h], , [AC_MSG_ERROR([Could not find <sys/queue.h>])])
 AC_CHECK_HEADERS([sys/sysctl.h])
 AC_CHECK_HEADERS([sys/time.h])
 AC_CHECK_HEADERS([threads.h])