From 111cc3af4b6132fda47d18683a04985ca7c571c2 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Fri, 19 Apr 2024 14:28:43 -0400
Subject: config: Check for struct tm::tm_gmtoff

---
 config/header.mk   | 1 +
 config/tm-gmtoff.c | 9 +++++++++
 src/parse.c        | 2 +-
 3 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 config/tm-gmtoff.c

diff --git a/config/header.mk b/config/header.mk
index 04fbdec..38f1277 100644
--- a/config/header.mk
+++ b/config/header.mk
@@ -25,6 +25,7 @@ HEADERS := \
     ${GEN}/strerror-l.h \
     ${GEN}/strerror-r-gnu.h \
     ${GEN}/strerror-r-posix.h \
+    ${GEN}/tm-gmtoff.h \
     ${GEN}/uselocale.h
 
 ${GEN}/config.h: ${HEADERS}
diff --git a/config/tm-gmtoff.c b/config/tm-gmtoff.c
new file mode 100644
index 0000000..543df48
--- /dev/null
+++ b/config/tm-gmtoff.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+#include <time.h>
+
+int main(void) {
+	struct tm tm = {0};
+	return tm.tm_gmtoff;
+}
diff --git a/src/parse.c b/src/parse.c
index c2ae58f..a1155c0 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -1755,7 +1755,7 @@ static int parse_reftime(const struct bfs_parser *parser, struct bfs_expr *expr)
 	fprintf(stderr, "  - %04d-%02d-%02d\n", year, month, tm.tm_mday);
 	fprintf(stderr, "  - %04d-%02d-%02dT%02d:%02d:%02d\n", year, month, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
 
-#if __FreeBSD__
+#if BFS_HAS_TM_GMTOFF
 	int gmtoff = tm.tm_gmtoff;
 #else
 	int gmtoff = -timezone;
-- 
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